[clang] [clang][ARM][AArch64] Reapply "Define intrinsics guarded by __has_builtin on all platforms (#128222)" (PR #140910)

[Nick Sarnie via cfe-commits]

sarnex wrote:

Thanks, made https://github.com/llvm/llvm-project/pull/144172, will publish it early next week.

https://github.com/llvm/llvm-project/pull/140910