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

[Simon Pilgrim via cfe-commits]

RKSimon wrote:

@tru This patch at the very least needs to make it for 19.x but I was hoping we'd get some of the tuning improvements in as well - should we wait for those PRs or just get this committed and cherry picked straight away?

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