[clang] [compiler-rt] [llvm] [X86] AMD Zen 5 Initial enablement (PR #107964)

[Simon Pilgrim via cfe-commits]

https://github.com/RKSimon approved this pull request.

LGTM as a base patch (znver4 + extra isas) - we should hold off from cherry picking into 19.x until we see the scope of the follow up patches.

https://github.com/llvm/llvm-project/pull/107964