resolving https://github.com/llvm/llvm-project/pull/136807/files\#r2072089909

Author: Ankur-0429

clang/lib/CIR/CodeGen/CIRGenTypes.cpp

@@ -424,8 +424,8 @@ mlir::Type CIRGenTypes::convertType(QualType type) {
     // TODO(cir): Implement updateCompletedType for enums.
     assert(!cir.MissingFeatures::updateCompletedType());
     const EnumDecl *ED = cast<EnumType>(ty)->getDecl();
-    if (ED->isCompleteDefinition() || ED->isFixed())
-      return convertType(ED->getIntegerType());
+    if (auto integerType = ED->getIntegerType(); !integerType.isNull())
+	      return convertType(integerType);
     // Return a placeholder 'i32' type.  This can be changed later when the
     // type is defined (see UpdateCompletedType), but is likely to be the
     // "right" answer.