gh-142731: Prevent use-after-free in _PyObject_StoreInstanceAttribute with re-entrant __hash__ #144636
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…te and add regression test
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Fix a potential use-after-free when storing or deleting instance attributes if a re-entrant
__hash__mutates the instance__dict__during attribute handling.Temporarily INCREF the managed dict in the
Py_GIL_DISABLEDpath to ensure it remains alive across the call tostore_instance_attr_dict().builtin_delattr_implandbuiltin_setattr_implvia re-entrant__hash__#142731