Revert D22496604: NCCL Backend support for torch.bool
Test Plan: revert-hammer
Differential Revision:
D22496604 (https://github.com/pytorch/pytorch/commit/3626473105afff2598c30f0c04734488d79d9937)
Original commit changeset: a1a15381ec41
fbshipit-source-id: 693c2f9fd1df568508cbcf8c734c092cec3b0a72
