[llvm-branch-commits] [llvm] release/21.x: [X86] Use pseudo instructions to zero registers in `buildClearRegister` (#163358) (PR #164076)

[Phoebe Wang via llvm-branch-commits]

https://github.com/phoebewang approved this pull request.

LGTM, too.

https://github.com/llvm/llvm-project/pull/164076