[mlir][ods] Save the Enum info in EnumAttr

Author: Mogball

mlir/include/mlir/IR/EnumAttr.td

@@ -69,6 +69,9 @@ class EnumAttr<Dialect dialect, EnumAttrInfo enumInfo, string name = "",
     : AttrDef<dialect, enumInfo.className, traits> {
   let summary = enumInfo.summary;
 
+  // The backing enumeration.
+  EnumAttrInfo enum = enumInfo;
+
   // Inherit the C++ namespace from the enum.
   let cppNamespace = enumInfo.cppNamespace;