Revert D22432885: [pytorch][PR] unsafe_split, unsafe_split_with_sizes, unsafe_chunk operations
Test Plan: revert-hammer
Differential Revision:
D22432885 (https://github.com/pytorch/pytorch/commit/c17670ac50cc0dc493ab7248a2fe452b092ae405)
Original commit changeset: 324aef091b32
fbshipit-source-id: 6b7c52bde46932e1cf77f61e7035d8a641b0beb6
