[clang] [clang][ARM][AArch64] Define intrinsics guarded by __has_builtin on all platforms (PR #128222)

[Nick Sarnie via cfe-commits]

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@@ -36,6 +36,28 @@ typedef __SIZE_TYPE__ size_t;
 
 #include <intrin.h>
 
+#ifdef __ARM_ACLE
+// arm_acle.h needs some stdint types, but -ffreestanding prevents us from
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sarnex wrote:

`arm_acle.h` already includes the correct header, `stdint.h`, the problem here is this test uses a custom `stdint.h` in the `Inputs/include` directory that doesn't have the required types, a better fix is to just add this code to that custom `stdint.h`, I'll do that in the next commit, thanks.

https://github.com/llvm/llvm-project/pull/128222