Don't use Py_SIZE for dict object. (#747)

Objects/dictobject.c

@@ -1915,7 +1915,7 @@ _PyDict_FromKeys(PyObject *cls, PyObject *iterable, PyObject *value)
             PyObject *key;
             Py_hash_t hash;
 
-            if (dictresize(mp, ESTIMATE_SIZE(Py_SIZE(iterable)))) {
+            if (dictresize(mp, ESTIMATE_SIZE(PyDict_GET_SIZE(iterable)))) {
                 Py_DECREF(d);
                 return NULL;
             }