diff --git a/lib/Transforms/Coroutines/CoroFrame.cpp b/lib/Transforms/Coroutines/CoroFrame.cpp
index 4d7fe644629..f19f6a50ddd 100644
--- a/lib/Transforms/Coroutines/CoroFrame.cpp
+++ b/lib/Transforms/Coroutines/CoroFrame.cpp
@@ -48,7 +48,7 @@ public:
   BlockToIndexMapping(Function &F) {
     for (BasicBlock &BB : F)
       V.push_back(&BB);
-    std::sort(V.begin(), V.end());
+    llvm::sort(V.begin(), V.end());
   }
 
   size_t blockToIndex(BasicBlock *BB) const {
diff --git a/lib/Transforms/IPO/LowerTypeTests.cpp b/lib/Transforms/IPO/LowerTypeTests.cpp
index b29eeeacfec..b568445b724 100644
--- a/lib/Transforms/IPO/LowerTypeTests.cpp
+++ b/lib/Transforms/IPO/LowerTypeTests.cpp
@@ -1869,11 +1869,11 @@ bool LowerTypeTestsModule::lower() {
     }
     Sets.emplace_back(I, MaxIndex);
   }
-  std::sort(Sets.begin(), Sets.end(),
-            [](const std::pair<GlobalClassesTy::iterator, unsigned> &S1,
-               const std::pair<GlobalClassesTy::iterator, unsigned> &S2) {
-              return S1.second < S2.second;
-            });
+  llvm::sort(Sets.begin(), Sets.end(),
+             [](const std::pair<GlobalClassesTy::iterator, unsigned> &S1,
+                const std::pair<GlobalClassesTy::iterator, unsigned> &S2) {
+               return S1.second < S2.second;
+             });
 
   // For each disjoint set we found...
   for (const auto &S : Sets) {
@@ -1894,7 +1894,7 @@ bool LowerTypeTestsModule::lower() {
 
     // Order type identifiers by global index for determinism. This ordering is
     // stable as there is a one-to-one mapping between metadata and indices.
-    std::sort(TypeIds.begin(), TypeIds.end(), [&](Metadata *M1, Metadata *M2) {
+    llvm::sort(TypeIds.begin(), TypeIds.end(), [&](Metadata *M1, Metadata *M2) {
       return TypeIdInfo[M1].Index < TypeIdInfo[M2].Index;
     });
 
diff --git a/lib/Transforms/IPO/SampleProfile.cpp b/lib/Transforms/IPO/SampleProfile.cpp
index fd5fce42620..6444a3185f6 100644
--- a/lib/Transforms/IPO/SampleProfile.cpp
+++ b/lib/Transforms/IPO/SampleProfile.cpp
@@ -679,10 +679,10 @@ SampleProfileLoader::findIndirectCallFunctionSamples(
       Sum += NameFS.second.getEntrySamples();
       R.push_back(&NameFS.second);
     }
-    std::sort(R.begin(), R.end(),
-              [](const FunctionSamples *L, const FunctionSamples *R) {
-                return L->getEntrySamples() > R->getEntrySamples();
-              });
+    llvm::sort(R.begin(), R.end(),
+               [](const FunctionSamples *L, const FunctionSamples *R) {
+                 return L->getEntrySamples() > R->getEntrySamples();
+               });
   }
   return R;
 }
@@ -1170,13 +1170,13 @@ static SmallVector<InstrProfValueData, 2> SortCallTargets(
   SmallVector<InstrProfValueData, 2> R;
   for (auto I = M.begin(); I != M.end(); ++I)
     R.push_back({Function::getGUID(I->getKey()), I->getValue()});
-  std::sort(R.begin(), R.end(),
-            [](const InstrProfValueData &L, const InstrProfValueData &R) {
-              if (L.Count == R.Count)
-                return L.Value > R.Value;
-              else
-                return L.Count > R.Count;
-            });
+  llvm::sort(R.begin(), R.end(),
+             [](const InstrProfValueData &L, const InstrProfValueData &R) {
+               if (L.Count == R.Count)
+                 return L.Value > R.Value;
+               else
+                 return L.Count > R.Count;
+             });
   return R;
 }
 
diff --git a/lib/Transforms/Instrumentation/GCOVProfiling.cpp b/lib/Transforms/Instrumentation/GCOVProfiling.cpp
index 68b4d32d06a..44bb67902c8 100644
--- a/lib/Transforms/Instrumentation/GCOVProfiling.cpp
+++ b/lib/Transforms/Instrumentation/GCOVProfiling.cpp
@@ -272,7 +272,7 @@ namespace {
       write(Len);
       write(Number);
 
-      std::sort(
+      llvm::sort(
           SortedLinesByFile.begin(), SortedLinesByFile.end(),
           [](StringMapEntry<GCOVLines> *LHS, StringMapEntry<GCOVLines> *RHS) {
             return LHS->getKey() < RHS->getKey();
diff --git a/lib/Transforms/Instrumentation/SanitizerCoverage.cpp b/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
index d950e2e730f..4f0abc6bb78 100644
--- a/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
+++ b/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
@@ -659,11 +659,11 @@ void SanitizerCoverageModule::InjectTraceForSwitch(
           C = ConstantExpr::getCast(CastInst::ZExt, It.getCaseValue(), Int64Ty);
         Initializers.push_back(C);
       }
-      std::sort(Initializers.begin() + 2, Initializers.end(),
-                [](const Constant *A, const Constant *B) {
-                  return cast<ConstantInt>(A)->getLimitedValue() <
-                         cast<ConstantInt>(B)->getLimitedValue();
-                });
+      llvm::sort(Initializers.begin() + 2, Initializers.end(),
+                 [](const Constant *A, const Constant *B) {
+                   return cast<ConstantInt>(A)->getLimitedValue() <
+                          cast<ConstantInt>(B)->getLimitedValue();
+                 });
       ArrayType *ArrayOfInt64Ty = ArrayType::get(Int64Ty, Initializers.size());
       GlobalVariable *GV = new GlobalVariable(
           *CurModule, ArrayOfInt64Ty, false, GlobalVariable::InternalLinkage,
diff --git a/lib/Transforms/Scalar/ConstantHoisting.cpp b/lib/Transforms/Scalar/ConstantHoisting.cpp
index 598c024b4b3..4b53628e442 100644
--- a/lib/Transforms/Scalar/ConstantHoisting.cpp
+++ b/lib/Transforms/Scalar/ConstantHoisting.cpp
@@ -571,8 +571,8 @@ void ConstantHoistingPass::findAndMakeBaseConstant(
 /// rematerialized with an add from a common base constant.
 void ConstantHoistingPass::findBaseConstants() {
   // Sort the constants by value and type. This invalidates the mapping!
-  std::sort(ConstCandVec.begin(), ConstCandVec.end(),
-            [](const ConstantCandidate &LHS, const ConstantCandidate &RHS) {
+  llvm::sort(ConstCandVec.begin(), ConstCandVec.end(),
+             [](const ConstantCandidate &LHS, const ConstantCandidate &RHS) {
     if (LHS.ConstInt->getType() != RHS.ConstInt->getType())
       return LHS.ConstInt->getType()->getBitWidth() <
              RHS.ConstInt->getType()->getBitWidth();
diff --git a/lib/Transforms/Scalar/GVNHoist.cpp b/lib/Transforms/Scalar/GVNHoist.cpp
index 66bd27f48b6..663375b1416 100644
--- a/lib/Transforms/Scalar/GVNHoist.cpp
+++ b/lib/Transforms/Scalar/GVNHoist.cpp
@@ -748,11 +748,11 @@ private:
     // TODO: Remove fully-redundant expressions.
     // Get instruction from the Map, assume that all the Instructions
     // with same VNs have same rank (this is an approximation).
-    std::sort(Ranks.begin(), Ranks.end(),
-              [this, &Map](const VNType &r1, const VNType &r2) {
-                return (rank(*Map.lookup(r1).begin()) <
-                        rank(*Map.lookup(r2).begin()));
-              });
+    llvm::sort(Ranks.begin(), Ranks.end(),
+               [this, &Map](const VNType &r1, const VNType &r2) {
+                 return (rank(*Map.lookup(r1).begin()) <
+                         rank(*Map.lookup(r2).begin()));
+               });
 
     // - Sort VNs according to their rank, and start with lowest ranked VN
     // - Take a VN and for each instruction with same VN
diff --git a/lib/Transforms/Scalar/GVNSink.cpp b/lib/Transforms/Scalar/GVNSink.cpp
index c51738dc656..4368b68582e 100644
--- a/lib/Transforms/Scalar/GVNSink.cpp
+++ b/lib/Transforms/Scalar/GVNSink.cpp
@@ -239,7 +239,7 @@ public:
     SmallVector<std::pair<BasicBlock *, Value *>, 4> Ops;
     for (unsigned I = 0, E = PN->getNumIncomingValues(); I != E; ++I)
       Ops.push_back({PN->getIncomingBlock(I), PN->getIncomingValue(I)});
-    std::sort(Ops.begin(), Ops.end());
+    llvm::sort(Ops.begin(), Ops.end());
     for (auto &P : Ops) {
       Blocks.push_back(P.first);
       Values.push_back(P.second);
@@ -361,7 +361,7 @@ public:
 
     for (auto &U : I->uses())
       op_push_back(U.getUser());
-    std::sort(op_begin(), op_end());
+    llvm::sort(op_begin(), op_end());
   }
 
   void setMemoryUseOrder(unsigned MUO) { MemoryUseOrder = MUO; }
@@ -761,7 +761,7 @@ unsigned GVNSink::sinkBB(BasicBlock *BBEnd) {
   }
   if (Preds.size() < 2)
     return 0;
-  std::sort(Preds.begin(), Preds.end());
+  llvm::sort(Preds.begin(), Preds.end());
 
   unsigned NumOrigPreds = Preds.size();
   // We can only sink instructions through unconditional branches.
diff --git a/lib/Transforms/Scalar/GuardWidening.cpp b/lib/Transforms/Scalar/GuardWidening.cpp
index 200df9ded40..e7697e7838e 100644
--- a/lib/Transforms/Scalar/GuardWidening.cpp
+++ b/lib/Transforms/Scalar/GuardWidening.cpp
@@ -555,9 +555,9 @@ bool GuardWideningImpl::combineRangeChecks(
     // CurrentChecks.size() will typically be 3 here, but so far there has been
     // no need to hard-code that fact.
 
-    std::sort(CurrentChecks.begin(), CurrentChecks.end(),
-              [&](const GuardWideningImpl::RangeCheck &LHS,
-                  const GuardWideningImpl::RangeCheck &RHS) {
+    llvm::sort(CurrentChecks.begin(), CurrentChecks.end(),
+               [&](const GuardWideningImpl::RangeCheck &LHS,
+                   const GuardWideningImpl::RangeCheck &RHS) {
       return LHS.getOffsetValue().slt(RHS.getOffsetValue());
     });
 
diff --git a/lib/Transforms/Scalar/LoopSink.cpp b/lib/Transforms/Scalar/LoopSink.cpp
index 0cbea15a552..a2983e60b8f 100644
--- a/lib/Transforms/Scalar/LoopSink.cpp
+++ b/lib/Transforms/Scalar/LoopSink.cpp
@@ -200,10 +200,10 @@ static bool sinkInstruction(Loop &L, Instruction &I,
   SmallVector<BasicBlock *, 2> SortedBBsToSinkInto;
   SortedBBsToSinkInto.insert(SortedBBsToSinkInto.begin(), BBsToSinkInto.begin(),
                              BBsToSinkInto.end());
-  std::sort(SortedBBsToSinkInto.begin(), SortedBBsToSinkInto.end(),
-            [&](BasicBlock *A, BasicBlock *B) {
-              return *LoopBlockNumber.find(A) < *LoopBlockNumber.find(B);
-            });
+  llvm::sort(SortedBBsToSinkInto.begin(), SortedBBsToSinkInto.end(),
+             [&](BasicBlock *A, BasicBlock *B) {
+               return *LoopBlockNumber.find(A) < *LoopBlockNumber.find(B);
+             });
 
   BasicBlock *MoveBB = *SortedBBsToSinkInto.begin();
   // FIXME: Optimize the efficiency for cloned value replacement. The current
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index 3b24fdbb3dd..ef4ae4af5cf 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -1479,7 +1479,7 @@ bool LSRUse::HasFormulaWithSameRegs(const Formula &F) const {
   SmallVector<const SCEV *, 4> Key = F.BaseRegs;
   if (F.ScaledReg) Key.push_back(F.ScaledReg);
   // Unstable sort by host order ok, because this is only used for uniquifying.
-  std::sort(Key.begin(), Key.end());
+  llvm::sort(Key.begin(), Key.end());
   return Uniquifier.count(Key);
 }
 
@@ -1503,7 +1503,7 @@ bool LSRUse::InsertFormula(const Formula &F, const Loop &L) {
   SmallVector<const SCEV *, 4> Key = F.BaseRegs;
   if (F.ScaledReg) Key.push_back(F.ScaledReg);
   // Unstable sort by host order ok, because this is only used for uniquifying.
-  std::sort(Key.begin(), Key.end());
+  llvm::sort(Key.begin(), Key.end());
 
   if (!Uniquifier.insert(Key).second)
     return false;
@@ -4220,7 +4220,7 @@ void LSRInstance::FilterOutUndesirableDedicatedRegisters() {
           Key.push_back(F.ScaledReg);
         // Unstable sort by host order ok, because this is only used for
         // uniquifying.
-        std::sort(Key.begin(), Key.end());
+        llvm::sort(Key.begin(), Key.end());
 
         std::pair<BestFormulaeTy::const_iterator, bool> P =
           BestFormulae.insert(std::make_pair(Key, FIdx));
diff --git a/lib/Transforms/Scalar/MergeICmps.cpp b/lib/Transforms/Scalar/MergeICmps.cpp
index 0bfa254fdb0..5635f54f491 100644
--- a/lib/Transforms/Scalar/MergeICmps.cpp
+++ b/lib/Transforms/Scalar/MergeICmps.cpp
@@ -439,10 +439,10 @@ BCECmpChain::BCECmpChain(const std::vector<BasicBlock *> &Blocks, PHINode &Phi)
 #endif  // MERGEICMPS_DOT_ON
   // Reorder blocks by LHS. We can do that without changing the
   // semantics because we are only accessing dereferencable memory.
-  std::sort(Comparisons_.begin(), Comparisons_.end(),
-            [](const BCECmpBlock &a, const BCECmpBlock &b) {
-              return a.Lhs() < b.Lhs();
-            });
+  llvm::sort(Comparisons_.begin(), Comparisons_.end(),
+             [](const BCECmpBlock &a, const BCECmpBlock &b) {
+               return a.Lhs() < b.Lhs();
+             });
 #ifdef MERGEICMPS_DOT_ON
   errs() << "AFTER REORDERING:\n\n";
   dump();
diff --git a/lib/Transforms/Scalar/NewGVN.cpp b/lib/Transforms/Scalar/NewGVN.cpp
index 892bc7ffcee..e82f69a8aa9 100644
--- a/lib/Transforms/Scalar/NewGVN.cpp
+++ b/lib/Transforms/Scalar/NewGVN.cpp
@@ -958,7 +958,8 @@ static bool isCopyOfAPHI(const Value *V) {
 // order. The BlockInstRange numbers are generated in an RPO walk of the basic
 // blocks.
 void NewGVN::sortPHIOps(MutableArrayRef<ValPair> Ops) const {
-  std::sort(Ops.begin(), Ops.end(), [&](const ValPair &P1, const ValPair &P2) {
+  llvm::sort(Ops.begin(), Ops.end(),
+             [&](const ValPair &P1, const ValPair &P2) {
     return BlockInstRange.lookup(P1.second).first <
            BlockInstRange.lookup(P2.second).first;
   });
@@ -3423,10 +3424,10 @@ bool NewGVN::runGVN() {
   for (auto &B : RPOT) {
     auto *Node = DT->getNode(B);
     if (Node->getChildren().size() > 1)
-      std::sort(Node->begin(), Node->end(),
-                [&](const DomTreeNode *A, const DomTreeNode *B) {
-                  return RPOOrdering[A] < RPOOrdering[B];
-                });
+      llvm::sort(Node->begin(), Node->end(),
+                 [&](const DomTreeNode *A, const DomTreeNode *B) {
+                   return RPOOrdering[A] < RPOOrdering[B];
+                 });
   }
 
   // Now a standard depth first ordering of the domtree is equivalent to RPO.
@@ -3948,7 +3949,7 @@ bool NewGVN::eliminateInstructions(Function &F) {
         convertClassToDFSOrdered(*CC, DFSOrderedSet, UseCounts, ProbablyDead);
 
         // Sort the whole thing.
-        std::sort(DFSOrderedSet.begin(), DFSOrderedSet.end());
+        llvm::sort(DFSOrderedSet.begin(), DFSOrderedSet.end());
         for (auto &VD : DFSOrderedSet) {
           int MemberDFSIn = VD.DFSIn;
           int MemberDFSOut = VD.DFSOut;
@@ -4110,7 +4111,7 @@ bool NewGVN::eliminateInstructions(Function &F) {
     // If we have possible dead stores to look at, try to eliminate them.
     if (CC->getStoreCount() > 0) {
       convertClassToLoadsAndStores(*CC, PossibleDeadStores);
-      std::sort(PossibleDeadStores.begin(), PossibleDeadStores.end());
+      llvm::sort(PossibleDeadStores.begin(), PossibleDeadStores.end());
       ValueDFSStack EliminationStack;
       for (auto &VD : PossibleDeadStores) {
         int MemberDFSIn = VD.DFSIn;
diff --git a/lib/Transforms/Scalar/PlaceSafepoints.cpp b/lib/Transforms/Scalar/PlaceSafepoints.cpp
index 016b5d19940..6b1ae2c3cab 100644
--- a/lib/Transforms/Scalar/PlaceSafepoints.cpp
+++ b/lib/Transforms/Scalar/PlaceSafepoints.cpp
@@ -522,7 +522,7 @@ bool PlaceSafepoints::runOnFunction(Function &F) {
     };
     // We need the order of list to be stable so that naming ends up stable
     // when we split edges.  This makes test cases much easier to write.
-    std::sort(PollLocations.begin(), PollLocations.end(), OrderByBBName);
+    llvm::sort(PollLocations.begin(), PollLocations.end(), OrderByBBName);
 
     // We can sometimes end up with duplicate poll locations.  This happens if
     // a single loop is visited more than once.   The fact this happens seems
diff --git a/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp b/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
index f8adbc62f08..a97f6517cd5 100644
--- a/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
+++ b/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
@@ -1823,7 +1823,7 @@ static void relocationViaAlloca(
       }
     }
 
-    std::sort(Uses.begin(), Uses.end());
+    llvm::sort(Uses.begin(), Uses.end());
     auto Last = std::unique(Uses.begin(), Uses.end());
     Uses.erase(Last, Uses.end());
 
diff --git a/lib/Transforms/Scalar/SROA.cpp b/lib/Transforms/Scalar/SROA.cpp
index 83e5ade9247..d5ed97f900f 100644
--- a/lib/Transforms/Scalar/SROA.cpp
+++ b/lib/Transforms/Scalar/SROA.cpp
@@ -273,7 +273,7 @@ public:
     int OldSize = Slices.size();
     Slices.append(NewSlices.begin(), NewSlices.end());
     auto SliceI = Slices.begin() + OldSize;
-    std::sort(SliceI, Slices.end());
+    llvm::sort(SliceI, Slices.end());
     std::inplace_merge(Slices.begin(), SliceI, Slices.end());
   }
 
@@ -1057,7 +1057,7 @@ AllocaSlices::AllocaSlices(const DataLayout &DL, AllocaInst &AI)
 
   // Sort the uses. This arranges for the offsets to be in ascending order,
   // and the sizes to be in descending order.
-  std::sort(Slices.begin(), Slices.end());
+  llvm::sort(Slices.begin(), Slices.end());
 }
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
@@ -1891,7 +1891,7 @@ static VectorType *isVectorPromotionViable(Partition &P, const DataLayout &DL) {
              "All non-integer types eliminated!");
       return RHSTy->getNumElements() < LHSTy->getNumElements();
     };
-    std::sort(CandidateTys.begin(), CandidateTys.end(), RankVectorTypes);
+    llvm::sort(CandidateTys.begin(), CandidateTys.end(), RankVectorTypes);
     CandidateTys.erase(
         std::unique(CandidateTys.begin(), CandidateTys.end(), RankVectorTypes),
         CandidateTys.end());
@@ -4152,7 +4152,7 @@ bool SROA::splitAlloca(AllocaInst &AI, AllocaSlices &AS) {
   }
 
   if (!IsSorted)
-    std::sort(AS.begin(), AS.end());
+    llvm::sort(AS.begin(), AS.end());
 
   /// Describes the allocas introduced by rewritePartition in order to migrate
   /// the debug info.
diff --git a/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp b/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
index e3d2c1702df..bbe17ed627f 100644
--- a/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
+++ b/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
@@ -1128,11 +1128,12 @@ static Loop *buildClonedLoops(Loop &OrigL, ArrayRef<BasicBlock *> ExitBlocks,
   // matter as we're just trying to build up the map from inside-out; we use
   // the map in a more stably ordered way below.
   auto OrderedClonedExitsInLoops = ClonedExitsInLoops;
-  std::sort(OrderedClonedExitsInLoops.begin(), OrderedClonedExitsInLoops.end(),
-            [&](BasicBlock *LHS, BasicBlock *RHS) {
-              return ExitLoopMap.lookup(LHS)->getLoopDepth() <
-                     ExitLoopMap.lookup(RHS)->getLoopDepth();
-            });
+  llvm::sort(OrderedClonedExitsInLoops.begin(),
+             OrderedClonedExitsInLoops.end(),
+             [&](BasicBlock *LHS, BasicBlock *RHS) {
+               return ExitLoopMap.lookup(LHS)->getLoopDepth() <
+                      ExitLoopMap.lookup(RHS)->getLoopDepth();
+             });
 
   // Populate the existing ExitLoopMap with everything reachable from each
   // exit, starting from the inner most exit.
diff --git a/lib/Transforms/Utils/ImportedFunctionsInliningStatistics.cpp b/lib/Transforms/Utils/ImportedFunctionsInliningStatistics.cpp
index b8c12ad5ea8..8382220fc9e 100644
--- a/lib/Transforms/Utils/ImportedFunctionsInliningStatistics.cpp
+++ b/lib/Transforms/Utils/ImportedFunctionsInliningStatistics.cpp
@@ -161,7 +161,7 @@ void ImportedFunctionsInliningStatistics::dump(const bool Verbose) {
 
 void ImportedFunctionsInliningStatistics::calculateRealInlines() {
   // Removing duplicated Callers.
-  std::sort(NonImportedCallers.begin(), NonImportedCallers.end());
+  llvm::sort(NonImportedCallers.begin(), NonImportedCallers.end());
   NonImportedCallers.erase(
       std::unique(NonImportedCallers.begin(), NonImportedCallers.end()),
       NonImportedCallers.end());
@@ -190,13 +190,14 @@ ImportedFunctionsInliningStatistics::getSortedNodes() {
   for (const NodesMapTy::value_type& Node : NodesMap)
     SortedNodes.push_back(&Node);
 
-  std::sort(
+  llvm::sort(
       SortedNodes.begin(), SortedNodes.end(),
       [&](const SortedNodesTy::value_type &Lhs,
           const SortedNodesTy::value_type &Rhs) {
         if (Lhs->second->NumberOfInlines != Rhs->second->NumberOfInlines)
           return Lhs->second->NumberOfInlines > Rhs->second->NumberOfInlines;
-        if (Lhs->second->NumberOfRealInlines != Rhs->second->NumberOfRealInlines)
+        if (Lhs->second->NumberOfRealInlines !=
+            Rhs->second->NumberOfRealInlines)
           return Lhs->second->NumberOfRealInlines >
                  Rhs->second->NumberOfRealInlines;
         return Lhs->first() < Rhs->first();
diff --git a/lib/Transforms/Utils/LowerSwitch.cpp b/lib/Transforms/Utils/LowerSwitch.cpp
index 80b943588a1..f18bd2539a7 100644
--- a/lib/Transforms/Utils/LowerSwitch.cpp
+++ b/lib/Transforms/Utils/LowerSwitch.cpp
@@ -382,7 +382,7 @@ unsigned LowerSwitch::Clusterify(CaseVector& Cases, SwitchInst *SI) {
     Cases.push_back(CaseRange(Case.getCaseValue(), Case.getCaseValue(),
                               Case.getCaseSuccessor()));
 
-  std::sort(Cases.begin(), Cases.end(), CaseCmp());
+  llvm::sort(Cases.begin(), Cases.end(), CaseCmp());
 
   // Merge case into clusters
   if (Cases.size() >= 2) {
diff --git a/lib/Transforms/Utils/PredicateInfo.cpp b/lib/Transforms/Utils/PredicateInfo.cpp
index 3c236d6a7ba..2676f6673ac 100644
--- a/lib/Transforms/Utils/PredicateInfo.cpp
+++ b/lib/Transforms/Utils/PredicateInfo.cpp
@@ -553,7 +553,7 @@ void PredicateInfo::renameUses(SmallPtrSetImpl<Value *> &OpSet) {
   auto Comparator = [&](const Value *A, const Value *B) {
     return valueComesBefore(OI, A, B);
   };
-  std::sort(OpsToRename.begin(), OpsToRename.end(), Comparator);
+  llvm::sort(OpsToRename.begin(), OpsToRename.end(), Comparator);
   ValueDFS_Compare Compare(OI);
   // Compute liveness, and rename in O(uses) per Op.
   for (auto *Op : OpsToRename) {
diff --git a/lib/Transforms/Utils/PromoteMemoryToRegister.cpp b/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
index e55b530b254..f43c82f58dd 100644
--- a/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
+++ b/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
@@ -475,7 +475,7 @@ static bool promoteSingleBlockAlloca(AllocaInst *AI, const AllocaInfo &Info,
 
   // Sort the stores by their index, making it efficient to do a lookup with a
   // binary search.
-  std::sort(StoresByIndex.begin(), StoresByIndex.end(), less_first());
+  llvm::sort(StoresByIndex.begin(), StoresByIndex.end(), less_first());
 
   // Walk all of the loads from this alloca, replacing them with the nearest
   // store above them, if any.
@@ -631,10 +631,10 @@ void PromoteMem2Reg::run() {
     SmallVector<BasicBlock *, 32> PHIBlocks;
     IDF.calculate(PHIBlocks);
     if (PHIBlocks.size() > 1)
-      std::sort(PHIBlocks.begin(), PHIBlocks.end(),
-                [this](BasicBlock *A, BasicBlock *B) {
-                  return BBNumbers.lookup(A) < BBNumbers.lookup(B);
-                });
+      llvm::sort(PHIBlocks.begin(), PHIBlocks.end(),
+                 [this](BasicBlock *A, BasicBlock *B) {
+                   return BBNumbers.lookup(A) < BBNumbers.lookup(B);
+                 });
 
     unsigned CurrentVersion = 0;
     for (BasicBlock *BB : PHIBlocks)
@@ -740,7 +740,7 @@ void PromoteMem2Reg::run() {
     // Ok, now we know that all of the PHI nodes are missing entries for some
     // basic blocks.  Start by sorting the incoming predecessors for efficient
     // access.
-    std::sort(Preds.begin(), Preds.end());
+    llvm::sort(Preds.begin(), Preds.end());
 
     // Now we loop through all BB's which have entries in SomePHI and remove
     // them from the Preds list.
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index 389ec419b5c..19c403a48e2 100644
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -5519,7 +5519,7 @@ static bool ReduceSwitchRange(SwitchInst *SI, IRBuilder<> &Builder,
   SmallVector<int64_t,4> Values;
   for (auto &C : SI->cases())
     Values.push_back(C.getCaseValue()->getValue().getSExtValue());
-  std::sort(Values.begin(), Values.end());
+  llvm::sort(Values.begin(), Values.end());
 
   // If the switch is already dense, there's nothing useful to do here.
   if (isSwitchDense(Values))
diff --git a/lib/Transforms/Utils/SplitModule.cpp b/lib/Transforms/Utils/SplitModule.cpp
index 7966fa43712..39a4e565c2e 100644
--- a/lib/Transforms/Utils/SplitModule.cpp
+++ b/lib/Transforms/Utils/SplitModule.cpp
@@ -180,12 +180,14 @@ static void findPartitions(Module *M, ClusterIDMapType &ClusterIDMap,
           std::make_pair(std::distance(GVtoClusterMap.member_begin(I),
                                        GVtoClusterMap.member_end()), I));
 
-  std::sort(Sets.begin(), Sets.end(), [](const SortType &a, const SortType &b) {
-    if (a.first == b.first)
-      return a.second->getData()->getName() > b.second->getData()->getName();
-    else
-      return a.first > b.first;
-  });
+  llvm::sort(Sets.begin(), Sets.end(),
+             [](const SortType &a, const SortType &b) {
+               if (a.first == b.first)
+                 return a.second->getData()->getName() >
+                        b.second->getData()->getName();
+               else
+                 return a.first > b.first;
+             });
 
   for (auto &I : Sets) {
     unsigned CurrentClusterID = BalancinQueue.top().first;