!5917 Add side effect flag for push kernel to bypass cse.

Merge pull request !5917 from ZPaC/master

mindspore/ops/operations/other_ops.py

@@ -532,6 +532,7 @@ class Push(PrimitiveWithInfer):
     def __init__(self, optim_type='ApplyMomentum', only_shape_indices=None):
         """init Push"""
         self.add_prim_attr("primitive_target", "CPU")
+        self.add_prim_attr("_side_effect", True)
         self.init_prim_io_names(inputs=['optim_inputs', 'optim_input_shapes'], outputs=['key'])
 
     def infer_shape(self, inputs, shapes):