[llvm] [X86] ptest is commutable as long as only the Z flag is used. (PR #88969)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> I guess this still needs SSE 4.1 coverage. @phoebewang do you want to pick this up?

Done by https://github.com/llvm/llvm-project/commit/17b86d5978af8d171fa28763a9e5eba3ce93713a, please rebase.

https://github.com/llvm/llvm-project/pull/88969