Revert D33744717: [pytorch][PR] Implement Tanh Gelu Approximation
Test Plan: revert-hammer
Differential Revision:
D33744717 (https://github.com/pytorch/pytorch/commit/f499ab9ceff49be0b64a15020103c6baec3387ea)
Original commit changeset: d64532a562ed
Original Phabricator Diff: D33744717 (https://github.com/pytorch/pytorch/commit/f499ab9ceff49be0b64a15020103c6baec3387ea)
fbshipit-source-id: 396c3f63de5865f894dbc353d0790a01a624be93
(cherry picked from commit e9fb2d1db1821c8a064975403de46ae6c4b3102c)
