Pass to remove prepacking ops. (#34319)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34319
Removes prepacking ops and install them as attributes of the top level
module. Needs to run freezing as the first pass.
Test Plan:
python test/test_xnnpack_integration.py
Imported from OSS
Differential Revision: D20290726
fbshipit-source-id: 633ceaa867ff7d5c8e69bd814c0362018394cb3a
