[JIT] Unshare types for modules that define() in __init__ (#44233)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44233
**Summary**
By default, scripting tries to share concrete and JIT types across
compilations. However, this can lead to incorrect results if a module
extends `torch.jit.ScriptModule`, and injects instance variables into
methods defined using `define`.
This commit detects when this has happened and disables type sharing
for the compilation of the module that uses `define` in `__init__`.
**Test Plan**
This commit adds a test to TestTypeSharing that tests this scenario.
**Fixes**
This commit fixes #43580.
Test Plan: Imported from OSS
Reviewed By: bertmaher
Differential Revision: D23553870
Pulled By: SplitInfinity
fbshipit-source-id: d756e87fcf239befa0012998ce29eeb25728d3e1
