[JIT] Optimize before inlining (#35562)
Summary:
Resubmit of https://github.com/pytorch/pytorch/pull/35424, only this time I run optimizations in the right order so the PR description is actually true.
This speeds up the inlining pass of FairSeq model from 180s -> 13s, and MaskRCNN model from 5s -> 1.5s.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35562
Differential Revision: D20738922
Pulled By: eellison
fbshipit-source-id: 1439cf9d1f0bc780e2d64a744694f8b3b7ba4b70
