pytorch

dedf9fbe - [package] factor out `PackageExporter._get_dependencies` (#57335)

[package] factor out `PackageExporter._get_dependencies` (#57335) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/57335 Mostly refactoring. The only behavioral change is that I have eliminated the `orig_source_file` argument to `save_source_string`. I think it doesn't provide enough marginal value (since if you have the module name you can get the source file anyway). Differential Revision: D28114184 Test Plan: Imported from OSS Reviewed By: VitalyFedyunin Pulled By: suo fbshipit-source-id: b5e9eb4250dc84552befeef2dcf9e591b32899ae