refactor _save_parameters to _save_data (#43162)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/43162
Test Plan: Imported from OSS
Reviewed By: iseeyuan
Differential Revision: D23175286
Pulled By: ann-ss
fbshipit-source-id: 6f930b98c367242fd4efbf51cb1d09995f7c4b40
