[clang] [llvm] [X86][Driver] Do not add `-evex512` for `-march=native` when the target doesn't support AVX512 (PR #91694)

[Phoebe Wang via cfe-commits]

phoebewang wrote:

> @phoebewang Can you add a release note for this on the PR for the release branch and then add the release:note label.

Done.

https://github.com/llvm/llvm-project/pull/91694