Switch from llvm::is_trivially_copyable to std::is_trivially_copyable

GCC<5 did not support std::is_trivially_copyable. Now LLVM builds require 5.1
we can migrate to std::is_trivially_copyable.

The Optional.h change made MSVC choke
(https://buildkite.com/llvm-project/premerge-checks/builds/18587#cd1bb616-ffdc-4581-9795-b42c284196de)
so I leave it out for now.

Differential Revision: https://reviews.llvm.org/D92514

docs/ProgrammersManual.rst

@@ -1530,7 +1530,7 @@ SmallVector has grown a few other minor advantages over std::vector, causing
 #. std::vector is exception-safe, and some implementations have pessimizations
    that copy elements when SmallVector would move them.
 
-#. SmallVector understands ``llvm::is_trivially_copyable<Type>`` and uses realloc aggressively.
+#. SmallVector understands ``std::is_trivially_copyable<Type>`` and uses realloc aggressively.
 
 #. Many LLVM APIs take a SmallVectorImpl as an out parameter (see the note
    below).

include/llvm/ADT/DenseMap.h

@@ -426,8 +426,8 @@ protected:
     setNumEntries(other.getNumEntries());
     setNumTombstones(other.getNumTombstones());
 
-    if (is_trivially_copyable<KeyT>::value &&
-        is_trivially_copyable<ValueT>::value)
+    if (std::is_trivially_copyable<KeyT>::value &&
+        std::is_trivially_copyable<ValueT>::value)
       memcpy(reinterpret_cast<void *>(getBuckets()), other.getBuckets(),
              getNumBuckets() * sizeof(BucketT));
     else

include/llvm/ADT/STLExtras.h

@@ -1428,7 +1428,7 @@ template <typename T>
 // is trivially copyable.
 using sort_trivially_copyable = conjunction<
     std::is_pointer<T>,
-    is_trivially_copyable<typename std::iterator_traits<T>::value_type>>;
+    std::is_trivially_copyable<typename std::iterator_traits<T>::value_type>>;
 } // namespace detail
 
 // Provide wrappers to std::sort which shuffle the elements before sorting

include/llvm/DebugInfo/CodeView/TypeHashing.h

@@ -171,15 +171,10 @@ struct GloballyHashedType {
     return Hashes;
   }
 };
-#if defined(_MSC_VER)
-// is_trivially_copyable is not available in older versions of libc++, but it is
-// available in all supported versions of MSVC, so at least this gives us some
-// coverage.
 static_assert(std::is_trivially_copyable<GloballyHashedType>::value,
               "GloballyHashedType must be trivially copyable so that we can "
               "reinterpret_cast arrays of hash data to arrays of "
               "GloballyHashedType");
-#endif
 } // namespace codeview
 
 template <> struct DenseMapInfo<codeview::LocallyHashedType> {

tools/llvm-diff/DifferenceEngine.cpp

@@ -67,7 +67,7 @@ public:
     unsigned NewSize = Storage.size() - 1;
     if (NewSize) {
       // Move the slot at the end to the beginning.
-      if (is_trivially_copyable<T>::value)
+      if (std::is_trivially_copyable<T>::value)
         Storage[0] = Storage[NewSize];
       else
         std::swap(Storage[0], Storage[NewSize]);

unittests/ADT/ArrayRefTest.cpp

@@ -262,7 +262,7 @@ TEST(ArrayRefTest, makeArrayRefFromStdArray) {
   }
 }
 
-static_assert(is_trivially_copyable<ArrayRef<int>>::value,
+static_assert(std::is_trivially_copyable<ArrayRef<int>>::value,
               "trivially copyable");
 
 } // end anonymous namespace

unittests/ADT/ImmutableListTest.cpp

@@ -267,7 +267,7 @@ TEST_F(ImmutableListTest, LongListOrderingTest) {
   ASSERT_EQ(6, i);
 }
 
-static_assert(is_trivially_copyable<ImmutableList<Wrapper<long>>>::value,
+static_assert(std::is_trivially_copyable<ImmutableList<Wrapper<long>>>::value,
               "trivially copyable");
 
 } // namespace

unittests/ADT/OptionalTest.cpp

@@ -17,10 +17,10 @@
 
 using namespace llvm;
 
-static_assert(is_trivially_copyable<Optional<int>>::value,
+static_assert(std::is_trivially_copyable<Optional<int>>::value,
               "trivially copyable");
 
-static_assert(is_trivially_copyable<Optional<std::array<int, 3>>>::value,
+static_assert(std::is_trivially_copyable<Optional<std::array<int, 3>>>::value,
               "trivially copyable");
 
 void OptionalWorksInConstexpr() {
@@ -66,7 +66,7 @@ unsigned NonDefaultConstructible::Destructions = 0;
 unsigned NonDefaultConstructible::CopyAssignments = 0;
 
 static_assert(
-      !is_trivially_copyable<Optional<NonDefaultConstructible>>::value,
+    !std::is_trivially_copyable<Optional<NonDefaultConstructible>>::value,
     "not trivially copyable");
 
 // Test fixture
@@ -227,8 +227,7 @@ struct MultiArgConstructor {
 };
 unsigned MultiArgConstructor::Destructions = 0;
 
-static_assert(
-  !is_trivially_copyable<Optional<MultiArgConstructor>>::value,
+static_assert(!std::is_trivially_copyable<Optional<MultiArgConstructor>>::value,
               "not trivially copyable");
 
 TEST_F(OptionalTest, Emplace) {
@@ -278,7 +277,7 @@ unsigned MoveOnly::MoveConstructions = 0;
 unsigned MoveOnly::Destructions = 0;
 unsigned MoveOnly::MoveAssignments = 0;
 
-static_assert(!is_trivially_copyable<Optional<MoveOnly>>::value,
+static_assert(!std::is_trivially_copyable<Optional<MoveOnly>>::value,
               "not trivially copyable");
 
 TEST_F(OptionalTest, MoveOnlyNull) {
@@ -382,7 +381,7 @@ private:
 unsigned Immovable::Constructions = 0;
 unsigned Immovable::Destructions = 0;
 
-static_assert(!is_trivially_copyable<Optional<Immovable>>::value,
+static_assert(!std::is_trivially_copyable<Optional<Immovable>>::value,
               "not trivially copyable");
 
 TEST_F(OptionalTest, ImmovableEmplace) {

unittests/ADT/PointerIntPairTest.cpp

@@ -62,7 +62,7 @@ TEST(PointerIntPairTest, GetSet) {
   EXPECT_EQ(&s, Pair2.getPointer());
   EXPECT_EQ(E::Case3, Pair2.getInt());
 
-  static_assert(is_trivially_copyable<PointerIntPair<S *, 2, E>>::value,
+  static_assert(std::is_trivially_copyable<PointerIntPair<S *, 2, E>>::value,
                 "trivially copyable");
 }
 
@@ -101,7 +101,7 @@ TEST(PointerIntPairTest, ManyUnusedBits) {
             (int)PointerLikeTypeTraits<decltype(pair)>::NumLowBitsAvailable);
 
   static_assert(
-      is_trivially_copyable<
+      std::is_trivially_copyable<
           PointerIntPair<Fixnum31, 1, bool, FixnumPointerTraits>>::value,
       "trivially copyable");
 }

unittests/ADT/StringRefTest.cpp

@@ -1087,6 +1087,7 @@ TEST(StringRefTest, GTestPrinter) {
   EXPECT_EQ(R"("foo")", ::testing::PrintToString(StringRef("foo")));
 }
 
-static_assert(is_trivially_copyable<StringRef>::value, "trivially copyable");
+static_assert(std::is_trivially_copyable<StringRef>::value,
+              "trivially copyable");
 
 } // end anonymous namespace

unittests/Analysis/BlockFrequencyInfoTest.cpp

@@ -91,7 +91,7 @@ TEST_F(BlockFrequencyInfoTest, Basic) {
   EXPECT_EQ(BFI.getBlockFreq(BB3).getFrequency(), BB3Freq);
 }
 
-static_assert(is_trivially_copyable<bfi_detail::BlockMass>::value,
+static_assert(std::is_trivially_copyable<bfi_detail::BlockMass>::value,
               "trivially copyable");
 
 } // end anonymous namespace

unittests/Bitstream/BitstreamReaderTest.cpp

@@ -161,7 +161,7 @@ TEST(BitstreamReaderTest, shortRead) {
   }
 }
 
-static_assert(is_trivially_copyable<BitCodeAbbrevOp>::value,
+static_assert(std::is_trivially_copyable<BitCodeAbbrevOp>::value,
               "trivially copyable");
 
 } // end anonymous namespace

unittests/CodeGen/MachineInstrTest.cpp

@@ -383,6 +383,7 @@ TEST(MachineInstrExtraInfo, RemoveExtraInfo) {
   ASSERT_FALSE(MI->getHeapAllocMarker());
 }
 
-static_assert(is_trivially_copyable<MCOperand>::value, "trivially copyable");
+static_assert(std::is_trivially_copyable<MCOperand>::value,
+              "trivially copyable");
 
 } // end namespace

unittests/CodeGen/TypeTraitsTest.cpp

@@ -12,14 +12,18 @@
 #include "llvm/CodeGen/SlotIndexes.h"
 #include "llvm/CodeGen/TargetPassConfig.h"
 #include "gtest/gtest.h"
+#include <type_traits>
 
 using namespace llvm;
 
 #if __has_feature(is_trivially_copyable) || (defined(__GNUC__) && __GNUC__ >= 5)
-static_assert(is_trivially_copyable<PressureChange>::value, "trivially copyable");
-static_assert(is_trivially_copyable<SDep>::value, "trivially copyable");
-static_assert(is_trivially_copyable<SDValue>::value, "trivially copyable");
-static_assert(is_trivially_copyable<SlotIndex>::value, "trivially copyable");
-static_assert(is_trivially_copyable<IdentifyingPassPtr>::value, "trivially copyable");
+static_assert(std::is_trivially_copyable<PressureChange>::value,
+              "trivially copyable");
+static_assert(std::is_trivially_copyable<SDep>::value, "trivially copyable");
+static_assert(std::is_trivially_copyable<SDValue>::value, "trivially copyable");
+static_assert(std::is_trivially_copyable<SlotIndex>::value,
+              "trivially copyable");
+static_assert(std::is_trivially_copyable<IdentifyingPassPtr>::value,
+              "trivially copyable");
 #endif
 

unittests/IR/CFGBuilder.cpp

@@ -267,10 +267,11 @@ TEST(CFGBuilder, Rebuild) {
   EXPECT_TRUE(isa<SwitchInst>(B.getOrAddBlock("d")->getTerminator()));
 }
 
-static_assert(is_trivially_copyable<succ_iterator>::value,
+static_assert(std::is_trivially_copyable<succ_iterator>::value,
               "trivially copyable");
-static_assert(is_trivially_copyable<const_succ_iterator>::value,
+static_assert(std::is_trivially_copyable<const_succ_iterator>::value,
               "trivially copyable");
-static_assert(is_trivially_copyable<succ_range>::value, "trivially copyable");
-static_assert(is_trivially_copyable<const_succ_range>::value,
+static_assert(std::is_trivially_copyable<succ_range>::value,
+              "trivially copyable");
+static_assert(std::is_trivially_copyable<const_succ_range>::value,
               "trivially copyable");

unittests/Support/ScaledNumberTest.cpp

@@ -562,7 +562,7 @@ TEST(ScaledNumberHelpersTest, toIntBug) {
   EXPECT_EQ(1u, (n * n).toInt<uint32_t>());
 }
 
-static_assert(is_trivially_copyable<ScaledNumber<uint32_t>>::value,
+static_assert(std::is_trivially_copyable<ScaledNumber<uint32_t>>::value,
               "trivially copyable");
 
 } // end namespace