fix: remove_cast bug

- 1. find CastOp need to be removed
- 2. fix bypass except CastOps removed

Change-Id: If5cae76124cbc3d454260e7ca5175ad8e7736d19

Author: yifan.chen

python/transform/OnnxOpt.py

@@ -973,7 +973,7 @@ def insert_identity(cur_node_out, out_name):
         for node in self.nodes:
             if node.op_type == "Constant":
                 continue
-            if node.op_type == "Cast":
+            if node.op_type == "Cast" and node in cast_ops:
                 continue
             for i in range(len(node.input)):
                 if node.input[i] in cast_in_dict: