[clang] [llvm] Reland [clang][AArch64] Add getHostCPUFeatures to query for enabled f… (PR #115467)

[Elvina Yakubova via cfe-commits]

ElvinaYakubova wrote:

@davemgreen all tests are shown as passed, and I noticed the same failure on some other PRs. Can this be an infrastructure problem then? 
Regarding the original error - it was showing "unsupported argument 'native' to option '-mcpu='" for the cases where the target was AArch64 and the host was X86, that's why I added a check to compare host and target. And also there was a crash for Darwin systems, since we added this feature only for AArch64+linux case.

https://github.com/llvm/llvm-project/pull/115467