Avoid non-exported dict helpers in _asyncio

Author: KRRT7

Modules/_asynciomodule.c

@@ -403,30 +403,18 @@ loop_has_instance_call_soon_shadow(PyObject *loop)
     // Respect instance-level monkeypatching such as:
     //     loop.call_soon = custom_call_soon
     // These must keep using the public slow path.
-    PyTypeObject *loop_type = Py_TYPE(loop);
     PyObject *attr = NULL;
-
-    if ((loop_type->tp_flags & Py_TPFLAGS_INLINE_VALUES) &&
-        _PyObject_TryGetInstanceAttribute(loop, &_Py_ID(call_soon), &attr)) {
-        int has_shadow = attr != NULL;
-        Py_XDECREF(attr);
-        return has_shadow;
-    }
-
-    PyObject *dict;
-    if (loop_type->tp_flags & Py_TPFLAGS_MANAGED_DICT) {
-        dict = (PyObject *)_PyObject_GetManagedDict(loop);
-    }
-    else {
-        PyObject **dictptr = _PyObject_ComputedDictPointer(loop);
-        dict = dictptr != NULL ? FT_ATOMIC_LOAD_PTR_ACQUIRE(*dictptr) : NULL;
-    }
-
+    PyObject *dict = PyObject_GenericGetDict(loop, NULL);
     if (dict == NULL) {
-        return 0;
+        if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
+            PyErr_Clear();
+            return 0;
+        }
+        return -1;
     }
 
     int rc = PyDict_GetItemRef(dict, &_Py_ID(call_soon), &attr);
+    Py_DECREF(dict);
     if (rc < 0) {
         return -1;
     }