[clang] [APINotes] Avoid duplicated attributes for class template instantiations (PR #122516)

[Saleem Abdulrasool via cfe-commits]

================
@@ -19493,7 +19493,11 @@ void Sema::ActOnFields(Scope *S, SourceLocation 
RecLoc, Decl *EnclosingDecl,
       CDecl->setIvarRBraceLoc(RBrac);
     }
   }
-  ProcessAPINotes(Record);
+
+  // If this is a class template instantiation, its API Notes attributes were
+  // added to the class template itself. Make sure they are not added twice.
+  if (!CXXRecord || !CXXRecord->getDescribedClassTemplate())
----------------
compnerd wrote:

I wonder if we should sink this into `ProcessAPINotes` instead.

https://github.com/llvm/llvm-project/pull/122516
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