fix send for old dygraph mode by passing use_calc_stream to the send op (#47110) (#47201)

python/paddle/distributed/fleet/meta_parallel/pp_utils/p2p_communication.py

@@ -199,7 +199,8 @@ def send_partial(tensor,
         dst_rank = _hcg._get_p2p_next_rank(
         ) if dst == 1 else _hcg._get_p2p_prev_rank()
         if _in_legacy_dygraph():
-            send_op = paddle.distributed.send
+            send_op = lambda x, dst, group: \
+                    paddle.distributed.send(x, dst, group, use_calc_stream)
         elif in_dygraph_mode():
             send_op = paddle.distributed.isend
         return send_op(tensor.detach(), dst=dst_rank, group=group)