[clang] [llvm] [PowerPC][AIX] Support #pragma comment copyright for AIX (PR #178184)

[Hubert Tong via cfe-commits]

================
@@ -4092,6 +4129,18 @@ bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
   return getContext().DeclMustBeEmitted(Global);
 }
 
+void CodeGenModule::EmitLoadTimeComment() {
+  // Emit copyright metadata for #pragma comment(copyright, ...).
+  // The LoadTimeComment is set during pragma processing and contains the
+  // copyright string that will be embedded in the .text section of the
+  // XCOFF object file and loaded into memory when the program runs.
+
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hubert-reinterpretcast wrote:

IMO, everything that needs to be said is already said in the Doxygen-style comment for this function in the header.
```suggestion
```

https://github.com/llvm/llvm-project/pull/178184