[llvm] [SystemZ] Implement .machine (push|pop) directives (PR #137302)

[Dominik Steenken via llvm-commits]

dominik-steenken wrote:

>From what i can tell, this `lldb` check fail exists on `main` as well. Not sure what to do about this, for now i'll just rebase.

https://github.com/llvm/llvm-project/pull/137302