Given the persistent id code a shot at a class before calling save_global().

Some persistent picklers (well, probably, the *only* persistent
pickler) would like to pickle some classes in a special way.
diff --git a/Modules/cPickle.c b/Modules/cPickle.c
index 91a63bf..ce32683 100644
--- a/Modules/cPickle.c
+++ b/Modules/cPickle.c
@@ -2015,11 +2015,6 @@
 		}
 	}
 
-	if (PyType_IsSubtype(type, &PyType_Type)) {
-		res = save_global(self, args, NULL);
-		goto finally;
-	}
-
 	if (!pers_save && self->inst_pers_func) {
 		if ((tmp = save_pers(self, args, self->inst_pers_func)) != 0) {
 			res = tmp;
@@ -2027,6 +2022,11 @@
 		}
 	}
 
+	if (PyType_IsSubtype(type, &PyType_Type)) {
+		res = save_global(self, args, NULL);
+		goto finally;
+	}
+
 	if ((__reduce__ = PyDict_GetItem(dispatch_table, (PyObject *)type))) {
 		Py_INCREF(__reduce__);