Revert D28547564: [pytorch][PR] masked_scatter thrust->cub
Test Plan: revert-hammer
Differential Revision:
D28547564 (https://github.com/pytorch/pytorch/commit/5152cf86471f7f3a2c5fecb91d3fd4423b46c8f9)
Original commit changeset: 83aeddfaf702
fbshipit-source-id: d5259afb584e0f6c0a11de4d4cb3d56a2a562eb7
