Revert D22079377: [pytorch][PR] [RELAND] Change AccumulateGrad to yield `.grad`s that match weights' memory layout
Test Plan: revert-hammer
Differential Revision:
D22079377
Original commit changeset: 9bd2b7e0c34f
fbshipit-source-id: c22cc349d790caa574eace0d63980854c33e5a59
