[clang] [Clang][Sema] Fix missing warning when comparing mismatched enums in … (PR #81418)

[Shafik Yaghmour via cfe-commits]

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@@ -263,6 +263,14 @@ namespace {
   }
 }
 
+QualType Expr::getEnumCoercedType(const ASTContext &Ctx) const {
+  bool NotEnumType = dyn_cast<EnumType>(this->getType()) == nullptr;
+  if (NotEnumType)
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shafik wrote:

This look redundant since `getEnumConstantDecl()` will just return `nullptr`

https://github.com/llvm/llvm-project/pull/81418