binary_op1(), ternary_op(): rearrange the code so that slotw is tested

(to see whether __rop__ should go before __op__) only when slotv is
set.  This saves a test+branch when only slotw is set.

Objects/abstract.c

@@ -332,6 +332,7 @@ binary_op1(PyObject *v, PyObject *w, const int op_slot)
 		if (slotw == slotv)
 			slotw = NULL;
 	}
+	if (slotv) {
 		if (slotw && PyType_IsSubtype(w->ob_type, v->ob_type)) {
 			x = slotw(v, w);
 			if (x != Py_NotImplemented)
@@ -339,7 +340,6 @@ binary_op1(PyObject *v, PyObject *w, const int op_slot)
 			Py_DECREF(x); /* can't do it */
 			slotw = NULL;
 		}
-	if (slotv) {
 		x = slotv(v, w);
 		if (x != Py_NotImplemented)
 			return x;
@@ -442,6 +442,7 @@ ternary_op(PyObject *v,
 		if (slotw == slotv)
 			slotw = NULL;
 	}
+	if (slotv) {
 		if (slotw && PyType_IsSubtype(w->ob_type, v->ob_type)) {
 			x = slotw(v, w, z);
 			if (x != Py_NotImplemented)
@@ -449,7 +450,6 @@ ternary_op(PyObject *v,
 			Py_DECREF(x); /* can't do it */
 			slotw = NULL;
 		}
-	if (slotv) {
 		x = slotv(v, w, z);
 		if (x != Py_NotImplemented)
 			return x;