[clang] [llvm] [Clang][AIX] Add -mloadtime-comment-vars flag to preserve identifying variables (PR #187986)

[Aaron Ballman via llvm-commits]

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@@ -15576,6 +15679,12 @@ void Sema::FinalizeDeclaration(Decl *ThisDecl) {
     }
   }
 
+  // Validate variables named in '-mloadtime-comment-vars=': supported string
+  // variables get an implicit attribute that CodeGen uses to preserve them;
+  // named variables that cannot be preserved are diagnosed.
+  if (!getLangOpts().LoadTimeCommentVars.empty() && !VD->isInvalidDecl())
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AaronBallman wrote:

I think it'd make more sense to move this predicate into `processForLoadTimeCommentVar()` and call `Sema::ProcessLoadTimeCommentVar()` from here instead of calling the helper function.

https://github.com/llvm/llvm-project/pull/187986