Add quant-passes stubs. (#18151)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18151
ghimport-source-id: 7d12462971bdf3e5e26a3f150f1fcad05bba1a15
Stack from [ghstack](https://github.com/ezyang/ghstack):
* #18152 Initial implementation of InsertObserverNodes pass.
* **#18151 Add quant-passes stubs.**
gh-metadata: pytorch pytorch 18149 gh/zolotukhinm@gmail.com/1/head
Differential Revision: D14584224
fbshipit-source-id: b3d0b5ff797160d5ad23f91f732e627b0129086c
Author
Mikhail Zolotukhin
