Address review

Author: sobolevn

Modules/_testinternalcapi/test_cases.c.h

@@ -2971,7 +2971,8 @@ dummy_func(
         op(_LOAD_ATTR_CLASS, (descr/4, owner -- attr)) {
             PyTypeObject *descr_type = Py_TYPE(descr);
             PyObject *owner_o = PyStackRef_AsPyObjectBorrow(owner);
-            EXIT_IF(descr_type != (PyTypeObject *)owner_o);
+            EXIT_IF((descr_type->tp_flags & Py_TPFLAGS_IMMUTABLETYPE) == 0
+                && descr_type != (PyTypeObject *)owner_o);
 
             STAT_INC(LOAD_ATTR, hit);
             assert(descr != NULL);