[clang] [llvm] Reland "[X86] Remove knl/knm specific ISAs supports (#92883)" (PR #93136)

[Freddy Ye via llvm-commits]

FreddyLeaf wrote:

> Not sure - CI checks aren't running either

Woops, I was thinking that is CI checks. I was just wondering for CI checks. Now it's recovered. Thanks anyway!

https://github.com/llvm/llvm-project/pull/93136