[jit] copy unused/ignored methods to ScriptModule during compilation (#33981)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33981
Okay it turns out that https://github.com/pytorch/pytorch/pull/29342
deletes actually useful things from the resulting Python module. In
particular, people like having `ignore`'d methods attached so that they
can invoke them from python.
Test Plan: Imported from OSS
Differential Revision: D20171650
Pulled By: suo
fbshipit-source-id: 71862e932c6a56cd055d0cff6657887ee0ceb9a8
