Fix the duplication problem in _unique_state_dict (#18139)
Summary:
Since parameter.data will create a new torch.Tensor each time, we get duplicate tensors when call _unique_state_dict now. Try to deduplicate it before creating new tensor.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18139
Reviewed By: dzhulgakov
Differential Revision: D14511262
Pulled By: houseroad
fbshipit-source-id: cb69795d0b6509721220650bbb19edeb3459a503
