InsertObservers for shared class types (#30548)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30548
ClassTypes can be shared among different module instances, but previously we assumed
they would be unique, this PR enables the insert_observers pass to work with shared class types
Test Plan:
python test/test_jit.py
python test/test_quantization.py
Imported from OSS
Differential Revision: D18802465
fbshipit-source-id: b782e71e44a043af45577ac2b5c83e695155bb8b
