[clang] [Clang] handle [[warn_unused]] attribute for unused private fields (PR #120734)

[Erich Keane via cfe-commits]

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@@ -3307,6 +3307,29 @@ void Sema::CheckShadowInheritedFields(const 
SourceLocation &Loc,
   }
 }
 
+template <typename AttrType>
+inline static bool HasAttribute(const QualType &T) {
----------------
erichkeane wrote:

Huh, that commit seems to be intentionally NO warning on unused private fields. 
 Are we sure we WANT this patch? 

https://github.com/llvm/llvm-project/pull/120734
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