[JIT] Virtualize Function (#33921)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33921
**NOTE FOR REVIEWERS**: This PR has internal Facebook specific changes or comments, please review them on [Phabricator](https://our.intern.facebook.com/intern/diff/D20153092/)!
Test Plan: Imported from OSS
Differential Revision: D20177227
Pulled By: jamesr66a
fbshipit-source-id: 87f3e484c4f873d60f76f50f6789c1b4a73bdfde
