Merge CompilationUnit from torch._C and torch.jit (#50614)
Summary:
This simplifies our handling and allows passing CompilationUnits from Python to C++ defined functions via PyBind easily.
Discussed on Slack with SplitInfinity
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50614
Reviewed By: anjali411
Differential Revision: D25938005
Pulled By: SplitInfinity
fbshipit-source-id: 94aadf0c063ddfef7ca9ea17bfa998d8e7b367ad
