[llvm] [X86] Support peephole optimization with CCMP instruction (PR #129994)

[Shengchen Kan via llvm-commits]

KanRobert wrote:

I think https://github.com/llvm/llvm-project/blob/main/llvm/test/CodeGen/X86/apx/ccmp.ll should reflect your change?

https://github.com/llvm/llvm-project/pull/129994