Revert D27155845: [pytorch][PR] Fixed the size of the workspace array in functions calling MAGMA
Test Plan: revert-hammer
Differential Revision:
D27155845 (https://github.com/pytorch/pytorch/commit/04a250609166327691105d463115ab16b6c3d420)
Original commit changeset: 04439bfa82a5
fbshipit-source-id: f45967e94883effbb43d8d0a019596f1f82caa56