This fixes compilation in the Clang-cl configuration on aarch64;
Clang doesn't implement all the aarch64 MSVC atomic intrinsics yet.
Differential Revision: https://reviews.llvm.org/D138737
// Synchronization primitives
-#if KMP_ASM_INTRINS && KMP_OS_WINDOWS && !((KMP_ARCH_AARCH64 || KMP_ARCH_ARM) && defined(__GNUC__))
+#if KMP_ASM_INTRINS && KMP_OS_WINDOWS && !((KMP_ARCH_AARCH64 || KMP_ARCH_ARM) && (KMP_COMPILER_CLANG || KMP_COMPILER_GCC))
#if KMP_MSVC_COMPAT && !KMP_COMPILER_CLANG
#pragma intrinsic(InterlockedExchangeAdd)