Revert D22994446: [pytorch][PR] CUDA reduction: allow outputs to have different strides
Test Plan: revert-hammer
Differential Revision:
D22994446 (https://github.com/pytorch/pytorch/commit/7f3f5020e6d930792c3db6b6604de74bb58aa291)
Original commit changeset: cc60beebad2e
fbshipit-source-id: f4635deac386db0c161f910760cace09f15a1ff9
