Py_DECREF() in interpreter doesn't call _PyReftracerTrack(op, PyRefTracer_DESTROY)

[colesbury]

Bug report

cpython/Python/ceval.c

Lines 72 to 85 in 6c450f4

	#undef Py_DECREF
	#define Py_DECREF(arg) \
	do { \
	PyObject *op = _PyObject_CAST(arg); \
	if (_Py_IsImmortal(op)) { \
	_Py_DECREF_IMMORTAL_STAT_INC(); \
	break; \
	} \
	_Py_DECREF_STAT_INC(); \
	if (--op->ob_refcnt == 0) { \
	destructor dealloc = Py_TYPE(op)->tp_dealloc; \
	(*dealloc)(op); \
	} \
	} while (0)

Tracemalloc only handles PyRefTracer_CREATE events and we don't have any tests for PyRefTracer_DESTROY events.