Revert D23391941: [pytorch][PR] Implementing NumPy-like function torch.heaviside()
Test Plan: revert-hammer
Differential Revision:
D23391941 (https://github.com/pytorch/pytorch/commit/a1eae6d158fdfd3ca9b4b09c56eb3da631b74bcb)
Original commit changeset: 7b942321a625
fbshipit-source-id: c2a7418a1fedaa9493300945c30e2392fc0d08ee
