diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -398,15 +398,6 @@
 
 check_symbol_exists(proc_pid_rusage "libproc.h" HAVE_PROC_PID_RUSAGE)
 
-# Whether we can use std::is_trivially_copyable to verify llvm::is_trivially_copyable.
-CHECK_CXX_SOURCE_COMPILES("
-#include <type_traits>
-struct T { int val; };
-static_assert(std::is_trivially_copyable<T>::value, \"ok\");
-int main() { return 0;}
-" HAVE_STD_IS_TRIVIALLY_COPYABLE)
-
-
 # Define LLVM_HAS_ATOMICS if gcc or MSVC atomic builtins are supported.
 include(CheckAtomic)
 
diff --git a/llvm/include/llvm/ADT/PointerIntPair.h b/llvm/include/llvm/ADT/PointerIntPair.h
--- a/llvm/include/llvm/ADT/PointerIntPair.h
+++ b/llvm/include/llvm/ADT/PointerIntPair.h
@@ -128,19 +128,6 @@
   }
 };
 
-// Specialize is_trivially_copyable to avoid limitation of llvm::is_trivially_copyable
-// when compiled with gcc 4.9.
-template <typename PointerTy, unsigned IntBits, typename IntType,
-          typename PtrTraits,
-          typename Info>
-struct is_trivially_copyable<PointerIntPair<PointerTy, IntBits, IntType, PtrTraits, Info>> : std::true_type {
-#ifdef HAVE_STD_IS_TRIVIALLY_COPYABLE
-  static_assert(std::is_trivially_copyable<PointerIntPair<PointerTy, IntBits, IntType, PtrTraits, Info>>::value,
-                "inconsistent behavior between llvm:: and std:: implementation of is_trivially_copyable");
-#endif
-};
-
-
 template <typename PointerT, unsigned IntBits, typename PtrTraits>
 struct PointerIntPairInfo {
   static_assert(PtrTraits::NumLowBitsAvailable <
diff --git a/llvm/include/llvm/Config/config.h.cmake b/llvm/include/llvm/Config/config.h.cmake
--- a/llvm/include/llvm/Config/config.h.cmake
+++ b/llvm/include/llvm/Config/config.h.cmake
@@ -320,9 +320,6 @@
 /* Define to the vendor of this package. */
 #cmakedefine PACKAGE_VENDOR "${PACKAGE_VENDOR}"
 
-/* Define if std::is_trivially_copyable is supported */
-#cmakedefine HAVE_STD_IS_TRIVIALLY_COPYABLE ${HAVE_STD_IS_TRIVIALLY_COPYABLE}
-
 /* Define to a function implementing stricmp */
 #cmakedefine stricmp ${stricmp}
 
diff --git a/llvm/include/llvm/Support/type_traits.h b/llvm/include/llvm/Support/type_traits.h
--- a/llvm/include/llvm/Support/type_traits.h
+++ b/llvm/include/llvm/Support/type_traits.h
@@ -93,61 +93,6 @@
     static constexpr bool value = decltype(get((T*)nullptr))::value;
 };
 
-
-// An implementation of `std::is_trivially_copyable` since STL version
-// is not equally supported by all compilers, especially GCC 4.9.
-// Uniform implementation of this trait is important for ABI compatibility
-// as it has an impact on SmallVector's ABI (among others).
-template <typename T>
-class is_trivially_copyable {
-
-  // copy constructors
-  static constexpr bool has_trivial_copy_constructor =
-      std::is_copy_constructible<detail::trivial_helper<T>>::value;
-  static constexpr bool has_deleted_copy_constructor =
-      !std::is_copy_constructible<T>::value;
-
-  // move constructors
-  static constexpr bool has_trivial_move_constructor =
-      std::is_move_constructible<detail::trivial_helper<T>>::value;
-  static constexpr bool has_deleted_move_constructor =
-      !std::is_move_constructible<T>::value;
-
-  // copy assign
-  static constexpr bool has_trivial_copy_assign =
-      is_copy_assignable<detail::trivial_helper<T>>::value;
-  static constexpr bool has_deleted_copy_assign =
-      !is_copy_assignable<T>::value;
-
-  // move assign
-  static constexpr bool has_trivial_move_assign =
-      is_move_assignable<detail::trivial_helper<T>>::value;
-  static constexpr bool has_deleted_move_assign =
-      !is_move_assignable<T>::value;
-
-  // destructor
-  static constexpr bool has_trivial_destructor =
-      std::is_destructible<detail::trivial_helper<T>>::value;
-
-  public:
-
-  static constexpr bool value =
-      has_trivial_destructor &&
-      (has_deleted_move_assign || has_trivial_move_assign) &&
-      (has_deleted_move_constructor || has_trivial_move_constructor) &&
-      (has_deleted_copy_assign || has_trivial_copy_assign) &&
-      (has_deleted_copy_constructor || has_trivial_copy_constructor);
-
-#ifdef HAVE_STD_IS_TRIVIALLY_COPYABLE
-  static_assert(value == std::is_trivially_copyable<T>::value,
-                "inconsistent behavior between llvm:: and std:: implementation of is_trivially_copyable");
-#endif
-};
-template <typename T>
-class is_trivially_copyable<T*> : public std::true_type {
-};
-
-
 } // end namespace llvm
 
 #endif // LLVM_SUPPORT_TYPE_TRAITS_H
diff --git a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
--- a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
@@ -95,7 +95,6 @@
     "HAVE_LIBPSAPI=",
     "HAVE_MALLCTL=",
     "HAVE_SIGNAL_H=1",
-    "HAVE_STD_IS_TRIVIALLY_COPYABLE=1",
     "HAVE_STRERROR=1",
     "HAVE_SYS_STAT_H=1",
     "HAVE_SYS_TYPES_H=1",
diff --git a/utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/config.h b/utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/config.h
--- a/utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/config.h
+++ b/utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/config.h
@@ -333,9 +333,6 @@
 /* Define to the vendor of this package. */
 /* #undef PACKAGE_VENDOR */
 
-/* Define if std::is_trivially_copyable is supported */
-#define HAVE_STD_IS_TRIVIALLY_COPYABLE 1
-
 /* Define to a function implementing stricmp */
 /* stricmp defined conditionally below. */
 
diff --git a/utils/bazel/llvm_configs/config.h.cmake b/utils/bazel/llvm_configs/config.h.cmake
--- a/utils/bazel/llvm_configs/config.h.cmake
+++ b/utils/bazel/llvm_configs/config.h.cmake
@@ -320,9 +320,6 @@
 /* Define to the vendor of this package. */
 #cmakedefine PACKAGE_VENDOR "${PACKAGE_VENDOR}"
 
-/* Define if std::is_trivially_copyable is supported */
-#cmakedefine HAVE_STD_IS_TRIVIALLY_COPYABLE ${HAVE_STD_IS_TRIVIALLY_COPYABLE}
-
 /* Define to a function implementing stricmp */
 #cmakedefine stricmp ${stricmp}