[llvm] [SystemZ][z/OS] Add a parameter Align to emitIncrement() and use 32 for XPLINK stack on z/OS. (PR #182348)

[Ulrich Weigand via llvm-commits]

https://github.com/uweigand requested changes to this pull request.

I would prefer to avoid the duplication here - the stack alignment is already stored in the TargetFrameLowering base class.  You might have to make `emitIncrement` a member function to be able to use that.

https://github.com/llvm/llvm-project/pull/182348