[llvm] [X86] Correct operand order of UWRMSR. (PR #76389)

[Phoebe Wang via llvm-commits]

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

LGTM.

I think we need to add Doxygen to make arguments clear to user since it's easily errorprone.

https://github.com/llvm/llvm-project/pull/76389