[clang] [compiler-rt] [AArch64] Implement __builtin_cpu_supports, compiler-rt tests. (PR #82378)

[Pavel Iliin via cfe-commits]

ilinpv wrote:

@alexfh thanks for example, clang doesn't compile that on x86 before patch as well. It looks like a bug in GCC that it happily compiles the builtin above on x86.

https://github.com/llvm/llvm-project/pull/82378