Move some of the helper functions for public use (#32202)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32202
Move some helper functions in ModuleUseDeduper for public use
Test Plan:
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Imported from OSS
Differential Revision: D19508034
fbshipit-source-id: 2e8e05eff6f3bbcfe6936598371e4afa72f9b11f
