Make PyDescr_IsData() a macro. It's too simple to be a function.

Should save 4% on slot lookups.

Include/descrobject.h

@@ -76,7 +76,7 @@ PyAPI_FUNC(PyObject *) PyDescr_NewGetSet(PyTypeObject *,
 					       struct PyGetSetDef *);
 PyAPI_FUNC(PyObject *) PyDescr_NewWrapper(PyTypeObject *,
 						struct wrapperbase *, void *);
-PyAPI_FUNC(int) PyDescr_IsData(PyObject *);
+#define PyDescr_IsData(d) ((d)->ob_type->tp_descr_set != NULL)
 
 PyAPI_FUNC(PyObject *) PyDictProxy_New(PyObject *);
 PyAPI_FUNC(PyObject *) PyWrapper_New(PyObject *, PyObject *);

Objects/descrobject.c

@@ -555,12 +555,6 @@ PyDescr_NewWrapper(PyTypeObject *type, struct wrapperbase *base, void *wrapped)
 	return (PyObject *)descr;
 }
 
-int
-PyDescr_IsData(PyObject *d)
-{
-	return d->ob_type->tp_descr_set != NULL;
-}
-
 
 /* --- Readonly proxy for dictionaries (actually any mapping) --- */