[clang] [llvm] [SystemZ][z/OS] Add options -m[no-]zos-ppa1-name to remove the function name in PPA1. (PR #207416)

[Ulrich Weigand via cfe-commits]

https://github.com/uweigand commented:

I don't think it's the correct place to handle this as a "language option" - it does not affect the accepted source language level at all.   Shouldn't this be handled more like a back-end specific codegen option e.g. like `-mbackchain` ?

https://github.com/llvm/llvm-project/pull/207416