Initial implementation of InsertObserverNodes pass. (#18152)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18152
ghimport-source-id:
1dd5e62c4d93394dcd8d8af2871554575c8d3d1a
Stack from [ghstack](https://github.com/ezyang/ghstack):
* **#18152 Initial implementation of InsertObserverNodes pass.**
* #18151 Add quant-passes stubs.
gh-metadata: pytorch pytorch 18150 gh/zolotukhinm@gmail.com/2/head
Differential Revision:
D14584223
fbshipit-source-id:
30896acc1a8901d22c6a167eb87d2fbaafbbeb6f