[clang] [AArch64][Driver] Enable host supported features with march=native. (PR #177128)

[Ricardo Jesus via cfe-commits]

rj-jesus wrote:

With the latest changes we should also infer the target CPU with march=native, which I believe should in turn enable the corresponding tuning. I'm not sure there's a direct way to test this - if you know of one and would like it tested here, please let me know.

https://github.com/llvm/llvm-project/pull/177128