Revert D31732420: Add x + 0 optimization
Test Plan: revert-hammer
Differential Revision:
D31732420 (https://github.com/pytorch/pytorch/commit/66543f88de4c16548fff9506698da92aa8acf917)
Original commit changeset: 0271e0dc0dda
fbshipit-source-id: c2beea1661e10c2f1a982b5d4a34b1041dcb1204
