Supporting making submodules unique (#30037)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30037
Support quantization for modules with reused submodules, e.g. relu (automatically make unique)
We first do a pass on the graph to find all duplicate uses of the same module, and record the `Value`s of the
module instance, for each of these values we create a new module and change the access to that module.
Test Plan:
python test/test_jit.py
Imported from OSS
Differential Revision: D18821483
fbshipit-source-id: 1698b981e9e9f0c728d9f03fcbcfbd260151f679
