pytorch

a326aad8 - Revert D16197608: [jit] Make classtypes hold a weak_ptr to their CU

Revert D16197608: [jit] Make classtypes hold a weak_ptr to their CU Differential Revision: D16197608 Original commit changeset: 22250d6f0d24 fbshipit-source-id: 47a8cdeb62b1033252070ecb92906358014b551a