[clang] [compiler-rt] [llvm] [X86] Sync multiversion cpu subtypes and vendors with libgcc and refactor internal cpu type tables (PR #171172)

[Mikołaj Piróg via cfe-commits]

mikolaj-pirog wrote:

Pinging @RKSimon  @phoebewang for review -- I've added some simple testing to make sure the right values are passed, but ideally we would like some runtime testing (though I don't know if it possible..). For now I think it's enough, let me know what you think

https://github.com/llvm/llvm-project/pull/171172