[PyTorch Mobile] Dedup method names in bytecode serialization (#53677)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53677
When serializing bytecode, we serialize it based on methods. It may happen that there are multiple instances of a class. In such a case, the methods inside the class may be serialized multiple times.
To reduce the duplication, we cache the qualified name of the methods, so that one method is serialized only once.
Test Plan: existing unittests and CI
Reviewed By: dhruvbird, raziel
Differential Revision: D26933945
Pulled By: iseeyuan
fbshipit-source-id: 8a9833949fa18f7103a5a0be19e2028040dc7717
