Set cloned flag after checked if copiable

class.c

@@ -354,16 +354,17 @@ static void ensure_origin(VALUE klass);
 VALUE
 rb_mod_init_copy(VALUE clone, VALUE orig)
 {
+    if (RB_TYPE_P(clone, T_CLASS)) {
+        class_init_copy_check(clone, orig);
+    }
+    if (!OBJ_INIT_COPY(clone, orig)) return clone;
+
     /* cloned flag is refer at constant inline cache
      * see vm_get_const_key_cref() in vm_insnhelper.c
      */
     FL_SET(clone, RCLASS_CLONED);
     FL_SET(orig , RCLASS_CLONED);
 
-    if (RB_TYPE_P(clone, T_CLASS)) {
-        class_init_copy_check(clone, orig);
-    }
-    if (!OBJ_INIT_COPY(clone, orig)) return clone;
     if (!FL_TEST(CLASS_OF(clone), FL_SINGLETON)) {
         RBASIC_SET_CLASS(clone, rb_singleton_class_clone(orig));
         rb_singleton_class_attached(RBASIC(clone)->klass, (VALUE)clone);