Folding constant enum access into constant int value

new_ast.cpp

@@ -593,4 +593,14 @@ query_struct(Ast_Struct *agg, Intern_String string){
     }
   }
   return 0;
+}
+
+function Ast_Enum_Member *
+query_enum(Ast_Enum *enu, Intern_String string){
+  For(enu->members){
+    if(it->name == string){
+      return it;
+    }
+  }
+  return 0;
 }