[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]

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@@ -595,6 +595,19 @@ class ZOSXPLinkTargetCodeGenInfo : public TargetCodeGenInfo {
     SwiftInfo =
         std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/false);
   }
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &M) const override {
+    if (dyn_cast_or_null<FunctionDecl>(D)) {
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uweigand wrote:

Instead of having a `FunctionDecl` check here, I think it would be preferable to move this to a place that is already function-specific.  For example `-mpacked-stack` is handled in `CodeGenFunction::StartFunction`, which seems an appropriate place for this as well.

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