diff --git a/include/llvm/CodeGen/FastISel.h b/include/llvm/CodeGen/FastISel.h
index 1dca2ce1ab2..f04a7cd6966 100644
--- a/include/llvm/CodeGen/FastISel.h
+++ b/include/llvm/CodeGen/FastISel.h
@@ -69,7 +69,7 @@ public:
     unsigned NumFixedArgs;
     CallingConv::ID CallConv;
     const Value *Callee;
-    const char *SymName;
+    MCSymbol *Symbol;
     ArgListTy Args;
     ImmutableCallSite *CS;
     MachineInstr *Call;
@@ -88,7 +88,7 @@ public:
         : RetTy(nullptr), RetSExt(false), RetZExt(false), IsVarArg(false),
           IsInReg(false), DoesNotReturn(false), IsReturnValueUsed(true),
           IsTailCall(false), NumFixedArgs(-1), CallConv(CallingConv::C),
-          Callee(nullptr), SymName(nullptr), CS(nullptr), Call(nullptr),
+          Callee(nullptr), Symbol(nullptr), CS(nullptr), Call(nullptr),
           ResultReg(0), NumResultRegs(0), IsPatchPoint(false) {}
 
     CallLoweringInfo &setCallee(Type *ResultTy, FunctionType *FuncTy,
@@ -114,12 +114,12 @@ public:
     }
 
     CallLoweringInfo &setCallee(Type *ResultTy, FunctionType *FuncTy,
-                                const char *Target, ArgListTy &&ArgsList,
+                                MCSymbol *Target, ArgListTy &&ArgsList,
                                 ImmutableCallSite &Call,
                                 unsigned FixedArgs = ~0U) {
       RetTy = ResultTy;
       Callee = Call.getCalledValue();
-      SymName = Target;
+      Symbol = Target;
 
       IsInReg = Call.paramHasAttr(0, Attribute::InReg);
       DoesNotReturn = Call.doesNotReturn();
@@ -148,11 +148,16 @@ public:
       return *this;
     }
 
-    CallLoweringInfo &setCallee(CallingConv::ID CC, Type *ResultTy,
+    CallLoweringInfo &setCallee(const DataLayout &DL, MCContext &Ctx,
+                                CallingConv::ID CC, Type *ResultTy,
                                 const char *Target, ArgListTy &&ArgsList,
+                                unsigned FixedArgs = ~0U);
+
+    CallLoweringInfo &setCallee(CallingConv::ID CC, Type *ResultTy,
+                                MCSymbol *Target, ArgListTy &&ArgsList,
                                 unsigned FixedArgs = ~0U) {
       RetTy = ResultTy;
-      SymName = Target;
+      Symbol = Target;
       CallConv = CC;
       Args = std::move(ArgsList);
       NumFixedArgs = (FixedArgs == ~0U) ? Args.size() : FixedArgs;
@@ -504,7 +509,9 @@ protected:
 
   CmpInst::Predicate optimizeCmpPredicate(const CmpInst *CI) const;
 
-  bool lowerCallTo(const CallInst *CI, const char *SymName, unsigned NumArgs);
+  bool lowerCallTo(const CallInst *CI, MCSymbol *Symbol, unsigned NumArgs);
+  bool lowerCallTo(const CallInst *CI, const char *SymbolName,
+                   unsigned NumArgs);
   bool lowerCallTo(CallLoweringInfo &CLI);
 
   bool isCommutativeIntrinsic(IntrinsicInst const *II) {
diff --git a/include/llvm/CodeGen/MachineInstrBuilder.h b/include/llvm/CodeGen/MachineInstrBuilder.h
index 47397c6d674..4f68f38b7bb 100644
--- a/include/llvm/CodeGen/MachineInstrBuilder.h
+++ b/include/llvm/CodeGen/MachineInstrBuilder.h
@@ -185,8 +185,9 @@ public:
     return *this;
   }
 
-  const MachineInstrBuilder &addSym(MCSymbol *Sym) const {
-    MI->addOperand(*MF, MachineOperand::CreateMCSymbol(Sym));
+  const MachineInstrBuilder &addSym(MCSymbol *Sym,
+                                    unsigned char TargetFlags = 0) const {
+    MI->addOperand(*MF, MachineOperand::CreateMCSymbol(Sym, TargetFlags));
     return *this;
   }
 
diff --git a/include/llvm/CodeGen/MachineOperand.h b/include/llvm/CodeGen/MachineOperand.h
index 04263fbea56..168d1de269e 100644
--- a/include/llvm/CodeGen/MachineOperand.h
+++ b/include/llvm/CodeGen/MachineOperand.h
@@ -705,10 +705,12 @@ public:
     return Op;
   }
 
-  static MachineOperand CreateMCSymbol(MCSymbol *Sym) {
+  static MachineOperand CreateMCSymbol(MCSymbol *Sym,
+                                       unsigned char TargetFlags = 0) {
     MachineOperand Op(MachineOperand::MO_MCSymbol);
     Op.Contents.Sym = Sym;
     Op.setOffset(0);
+    Op.setTargetFlags(TargetFlags);
     return Op;
   }
 
diff --git a/include/llvm/IR/Mangler.h b/include/llvm/IR/Mangler.h
index 1e6b5b1dca0..33ebe05eb01 100644
--- a/include/llvm/IR/Mangler.h
+++ b/include/llvm/IR/Mangler.h
@@ -51,6 +51,10 @@ public:
   /// Print the appropriate prefix and the specified global variable's name.
   /// If the global variable doesn't have a name, this fills in a unique name
   /// for the global.
+
+  static void getNameWithPrefix(SmallVectorImpl<char> &OutName,
+                                const Twine &GVName, const DataLayout &DL);
+
   void getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV,
                          bool CannotUsePrivateLabel) const;
   void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 0351c33c28e..350db6a94ee 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -59,6 +59,7 @@
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Mangler.h"
 #include "llvm/IR/Operator.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -701,6 +702,15 @@ bool FastISel::lowerCallOperands(const CallInst *CI, unsigned ArgIdx,
   return lowerCallTo(CLI);
 }
 
+FastISel::CallLoweringInfo &FastISel::CallLoweringInfo::setCallee(
+    const DataLayout &DL, MCContext &Ctx, CallingConv::ID CC, Type *ResultTy,
+    const char *Target, ArgListTy &&ArgsList, unsigned FixedArgs) {
+  SmallString<32> MangledName;
+  Mangler::getNameWithPrefix(MangledName, Target, DL);
+  MCSymbol *Sym = Ctx.getOrCreateSymbol(MangledName);
+  return setCallee(CC, ResultTy, Sym, std::move(ArgsList), FixedArgs);
+}
+
 bool FastISel::selectPatchpoint(const CallInst *I) {
   // void|i64 @llvm.experimental.patchpoint.void|i64(i64 <id>,
   //                                                 i32 <numBytes>,
@@ -856,6 +866,15 @@ static AttributeSet getReturnAttrs(FastISel::CallLoweringInfo &CLI) {
 
 bool FastISel::lowerCallTo(const CallInst *CI, const char *SymName,
                            unsigned NumArgs) {
+  MCContext &Ctx = MF->getContext();
+  SmallString<32> MangledName;
+  Mangler::getNameWithPrefix(MangledName, SymName, DL);
+  MCSymbol *Sym = Ctx.getOrCreateSymbol(MangledName);
+  return lowerCallTo(CI, Sym, NumArgs);
+}
+
+bool FastISel::lowerCallTo(const CallInst *CI, MCSymbol *Symbol,
+                           unsigned NumArgs) {
   ImmutableCallSite CS(CI);
 
   PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
@@ -880,7 +899,7 @@ bool FastISel::lowerCallTo(const CallInst *CI, const char *SymName,
   }
 
   CallLoweringInfo CLI;
-  CLI.setCallee(RetTy, FTy, SymName, std::move(Args), CS, NumArgs);
+  CLI.setCallee(RetTy, FTy, Symbol, std::move(Args), CS, NumArgs);
 
   return lowerCallTo(CLI);
 }
diff --git a/lib/IR/Mangler.cpp b/lib/IR/Mangler.cpp
index a0e1b25056c..db9b5e59c6a 100644
--- a/lib/IR/Mangler.cpp
+++ b/lib/IR/Mangler.cpp
@@ -20,9 +20,9 @@
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
-static void getNameWithPrefixx(raw_ostream &OS, const Twine &GVName,
-                              Mangler::ManglerPrefixTy PrefixTy,
-                              const DataLayout &DL, char Prefix) {
+static void getNameWithPrefixImpl(raw_ostream &OS, const Twine &GVName,
+                                  Mangler::ManglerPrefixTy PrefixTy,
+                                  const DataLayout &DL, char Prefix) {
   SmallString<256> TmpData;
   StringRef Name = GVName.toStringRef(TmpData);
   assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
@@ -49,14 +49,22 @@ static void getNameWithPrefixx(raw_ostream &OS, const Twine &GVName,
 void Mangler::getNameWithPrefix(raw_ostream &OS, const Twine &GVName,
                                 ManglerPrefixTy PrefixTy) const {
   char Prefix = DL->getGlobalPrefix();
-  return getNameWithPrefixx(OS, GVName, PrefixTy, *DL, Prefix);
+  return getNameWithPrefixImpl(OS, GVName, PrefixTy, *DL, Prefix);
+}
+
+void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
+                                const Twine &GVName, const DataLayout &DL) {
+  raw_svector_ostream OS(OutName);
+  char Prefix = DL.getGlobalPrefix();
+  return getNameWithPrefixImpl(OS, GVName, Mangler::Default, DL, Prefix);
 }
 
 void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
                                 const Twine &GVName,
                                 ManglerPrefixTy PrefixTy) const {
   raw_svector_ostream OS(OutName);
-  return getNameWithPrefix(OS, GVName, PrefixTy);
+  char Prefix = DL->getGlobalPrefix();
+  return getNameWithPrefixImpl(OS, GVName, PrefixTy, *DL, Prefix);
 }
 
 static bool hasByteCountSuffix(CallingConv::ID CC) {
@@ -132,7 +140,7 @@ void Mangler::getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV,
       Prefix = '\0'; // vectorcall functions have no prefix.
   }
 
-  getNameWithPrefixx(OS, Name, PrefixTy, *DL, Prefix);
+  getNameWithPrefixImpl(OS, Name, PrefixTy, *DL, Prefix);
 
   if (!MSFunc)
     return;
diff --git a/lib/Target/AArch64/AArch64FastISel.cpp b/lib/Target/AArch64/AArch64FastISel.cpp
index d1523e8548e..5424c18ae50 100644
--- a/lib/Target/AArch64/AArch64FastISel.cpp
+++ b/lib/Target/AArch64/AArch64FastISel.cpp
@@ -36,6 +36,7 @@
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/IR/Operator.h"
+#include "llvm/MC/MCSymbol.h"
 #include "llvm/Support/CommandLine.h"
 using namespace llvm;
 
@@ -3070,9 +3071,9 @@ bool AArch64FastISel::fastLowerCall(CallLoweringInfo &CLI) {
   bool IsTailCall     = CLI.IsTailCall;
   bool IsVarArg       = CLI.IsVarArg;
   const Value *Callee = CLI.Callee;
-  const char *SymName = CLI.SymName;
+  MCSymbol *Symbol = CLI.Symbol;
 
-  if (!Callee && !SymName)
+  if (!Callee && !Symbol)
     return false;
 
   // Allow SelectionDAG isel to handle tail calls.
@@ -3134,8 +3135,8 @@ bool AArch64FastISel::fastLowerCall(CallLoweringInfo &CLI) {
   if (CM == CodeModel::Small) {
     const MCInstrDesc &II = TII.get(Addr.getReg() ? AArch64::BLR : AArch64::BL);
     MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II);
-    if (SymName)
-      MIB.addExternalSymbol(SymName, 0);
+    if (Symbol)
+      MIB.addSym(Symbol, 0);
     else if (Addr.getGlobalValue())
       MIB.addGlobalAddress(Addr.getGlobalValue(), 0, 0);
     else if (Addr.getReg()) {
@@ -3145,18 +3146,18 @@ bool AArch64FastISel::fastLowerCall(CallLoweringInfo &CLI) {
       return false;
   } else {
     unsigned CallReg = 0;
-    if (SymName) {
+    if (Symbol) {
       unsigned ADRPReg = createResultReg(&AArch64::GPR64commonRegClass);
       BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADRP),
               ADRPReg)
-        .addExternalSymbol(SymName, AArch64II::MO_GOT | AArch64II::MO_PAGE);
+          .addSym(Symbol, AArch64II::MO_GOT | AArch64II::MO_PAGE);
 
       CallReg = createResultReg(&AArch64::GPR64RegClass);
-      BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::LDRXui),
-              CallReg)
-        .addReg(ADRPReg)
-        .addExternalSymbol(SymName, AArch64II::MO_GOT | AArch64II::MO_PAGEOFF |
-                           AArch64II::MO_NC);
+      BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
+              TII.get(AArch64::LDRXui), CallReg)
+          .addReg(ADRPReg)
+          .addSym(Symbol,
+                  AArch64II::MO_GOT | AArch64II::MO_PAGEOFF | AArch64II::MO_NC);
     } else if (Addr.getGlobalValue())
       CallReg = materializeGV(Addr.getGlobalValue());
     else if (Addr.getReg())
@@ -3460,7 +3461,8 @@ bool AArch64FastISel::fastLowerIntrinsicCall(const IntrinsicInst *II) {
     }
 
     CallLoweringInfo CLI;
-    CLI.setCallee(TLI.getLibcallCallingConv(LC), II->getType(),
+    MCContext &Ctx = MF->getContext();
+    CLI.setCallee(DL, Ctx, TLI.getLibcallCallingConv(LC), II->getType(),
                   TLI.getLibcallName(LC), std::move(Args));
     if (!lowerCallTo(CLI))
       return false;
@@ -4734,7 +4736,8 @@ bool AArch64FastISel::selectFRem(const Instruction *I) {
   }
 
   CallLoweringInfo CLI;
-  CLI.setCallee(TLI.getLibcallCallingConv(LC), I->getType(),
+  MCContext &Ctx = MF->getContext();
+  CLI.setCallee(DL, Ctx, TLI.getLibcallCallingConv(LC), I->getType(),
                 TLI.getLibcallName(LC), std::move(Args));
   if (!lowerCallTo(CLI))
     return false;
diff --git a/lib/Target/AArch64/AArch64MCInstLower.cpp b/lib/Target/AArch64/AArch64MCInstLower.cpp
index e55ae991b63..580427ab3cc 100644
--- a/lib/Target/AArch64/AArch64MCInstLower.cpp
+++ b/lib/Target/AArch64/AArch64MCInstLower.cpp
@@ -187,6 +187,9 @@ bool AArch64MCInstLower::lowerOperand(const MachineOperand &MO,
   case MachineOperand::MO_ExternalSymbol:
     MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
     break;
+  case MachineOperand::MO_MCSymbol:
+    MCOp = LowerSymbolOperand(MO, MO.getMCSymbol());
+    break;
   case MachineOperand::MO_JumpTableIndex:
     MCOp = LowerSymbolOperand(MO, Printer.GetJTISymbol(MO.getIndex()));
     break;
diff --git a/lib/Target/Mips/MipsFastISel.cpp b/lib/Target/Mips/MipsFastISel.cpp
index 3d020abe270..c2651b82d28 100644
--- a/lib/Target/Mips/MipsFastISel.cpp
+++ b/lib/Target/Mips/MipsFastISel.cpp
@@ -16,6 +16,7 @@
 #include "llvm/IR/GetElementPtrTypeIterator.h"
 #include "llvm/IR/GlobalAlias.h"
 #include "llvm/IR/GlobalVariable.h"
+#include "llvm/MC/MCSymbol.h"
 #include "llvm/Target/TargetInstrInfo.h"
 
 using namespace llvm;
@@ -143,7 +144,7 @@ private:
   unsigned materializeGV(const GlobalValue *GV, MVT VT);
   unsigned materializeInt(const Constant *C, MVT VT);
   unsigned materialize32BitInt(int64_t Imm, const TargetRegisterClass *RC);
-  unsigned materializeExternalCallSym(const char *SynName);
+  unsigned materializeExternalCallSym(MCSymbol *Syn);
 
   MachineInstrBuilder emitInst(unsigned Opc) {
     return BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc));
@@ -369,12 +370,12 @@ unsigned MipsFastISel::materializeGV(const GlobalValue *GV, MVT VT) {
   return DestReg;
 }
 
-unsigned MipsFastISel::materializeExternalCallSym(const char *SymName) {
+unsigned MipsFastISel::materializeExternalCallSym(MCSymbol *Sym) {
   const TargetRegisterClass *RC = &Mips::GPR32RegClass;
   unsigned DestReg = createResultReg(RC);
   emitInst(Mips::LW, DestReg)
       .addReg(MFI->getGlobalBaseReg())
-      .addExternalSymbol(SymName, MipsII::MO_GOT);
+      .addSym(Sym, MipsII::MO_GOT);
   return DestReg;
 }
 
@@ -1234,7 +1235,7 @@ bool MipsFastISel::fastLowerCall(CallLoweringInfo &CLI) {
   bool IsTailCall = CLI.IsTailCall;
   bool IsVarArg = CLI.IsVarArg;
   const Value *Callee = CLI.Callee;
-  const char *SymName = CLI.SymName;
+  MCSymbol *Symbol = CLI.Symbol;
 
   // Allow SelectionDAG isel to handle tail calls.
   if (IsTailCall)
@@ -1286,8 +1287,8 @@ bool MipsFastISel::fastLowerCall(CallLoweringInfo &CLI) {
 
   // Issue the call.
   unsigned DestAddress;
-  if (SymName)
-    DestAddress = materializeExternalCallSym(SymName);
+  if (Symbol)
+    DestAddress = materializeExternalCallSym(Symbol);
   else
     DestAddress = materializeGV(Addr.getGlobalValue(), MVT::i32);
   emitInst(TargetOpcode::COPY, Mips::T9).addReg(DestAddress);
diff --git a/lib/Target/Mips/MipsMCInstLower.cpp b/lib/Target/Mips/MipsMCInstLower.cpp
index 6b2a44d7a89..80d9b75b85b 100644
--- a/lib/Target/Mips/MipsMCInstLower.cpp
+++ b/lib/Target/Mips/MipsMCInstLower.cpp
@@ -88,6 +88,11 @@ MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
     Offset += MO.getOffset();
     break;
 
+  case MachineOperand::MO_MCSymbol:
+    Symbol = MO.getMCSymbol();
+    Offset += MO.getOffset();
+    break;
+
   case MachineOperand::MO_JumpTableIndex:
     Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
     break;
@@ -141,6 +146,7 @@ MCOperand MipsMCInstLower::LowerOperand(const MachineOperand &MO,
   case MachineOperand::MO_MachineBasicBlock:
   case MachineOperand::MO_GlobalAddress:
   case MachineOperand::MO_ExternalSymbol:
+  case MachineOperand::MO_MCSymbol:
   case MachineOperand::MO_JumpTableIndex:
   case MachineOperand::MO_ConstantPoolIndex:
   case MachineOperand::MO_BlockAddress:
diff --git a/lib/Target/PowerPC/PPCFastISel.cpp b/lib/Target/PowerPC/PPCFastISel.cpp
index a561d5b1190..fafcd76f9d1 100644
--- a/lib/Target/PowerPC/PPCFastISel.cpp
+++ b/lib/Target/PowerPC/PPCFastISel.cpp
@@ -1448,9 +1448,9 @@ bool PPCFastISel::fastLowerCall(CallLoweringInfo &CLI) {
   bool IsTailCall     = CLI.IsTailCall;
   bool IsVarArg       = CLI.IsVarArg;
   const Value *Callee = CLI.Callee;
-  const char *SymName = CLI.SymName;
+  const MCSymbol *Symbol = CLI.Symbol;
 
-  if (!Callee && !SymName)
+  if (!Callee && !Symbol)
     return false;
 
   // Allow SelectionDAG isel to handle tail calls.
diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index 3dc75d76cee..02645460b6a 100644
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -38,6 +38,7 @@
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/IR/Operator.h"
 #include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCSymbol.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Target/TargetOptions.h"
 using namespace llvm;
@@ -2821,7 +2822,7 @@ bool X86FastISel::fastLowerCall(CallLoweringInfo &CLI) {
   bool &IsTailCall    = CLI.IsTailCall;
   bool IsVarArg       = CLI.IsVarArg;
   const Value *Callee = CLI.Callee;
-  const char *SymName = CLI.SymName;
+  MCSymbol *Symbol = CLI.Symbol;
 
   bool Is64Bit        = Subtarget->is64Bit();
   bool IsWin64        = Subtarget->isCallingConvWin64(CC);
@@ -3117,8 +3118,8 @@ bool X86FastISel::fastLowerCall(CallLoweringInfo &CLI) {
     }
 
     MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CallOpc));
-    if (SymName)
-      MIB.addExternalSymbol(SymName, OpFlags);
+    if (Symbol)
+      MIB.addSym(Symbol, OpFlags);
     else
       MIB.addGlobalAddress(GV, 0, OpFlags);
   }