[llvm] [GOFF][z/OS] Change PrivateGlobalPrefix and PrivateLabelPrefix to be L# (PR #85730)

[Ulrich Weigand via llvm-commits]

uweigand wrote:

The following test cases are failing in CI, which seems to be related:
  LLVM :: CodeGen/SystemZ/call-zos-01.ll
  LLVM :: CodeGen/SystemZ/call-zos-i128.ll
  LLVM :: CodeGen/SystemZ/call-zos-vararg.ll

Can you have a look?   Otherwise, this seems reasonable to me.


https://github.com/llvm/llvm-project/pull/85730