Revert D33850228: [pytorch][PR] Implement Tanh Gelu Approximation
Test Plan: revert-hammer
Differential Revision:
D33850228 (https://github.com/pytorch/pytorch/commit/23d03025dc870a26c63a9d0e01aa59f644fd6cbe)
Original commit changeset: 3cc33fb298e4
Original Phabricator Diff: D33850228 (https://github.com/pytorch/pytorch/commit/23d03025dc870a26c63a9d0e01aa59f644fd6cbe)
fbshipit-source-id: 9436e7df73c2b2e2011f321674f24973316d3692
(cherry picked from commit c9efb582233fec9abfe86bb85d2b496047bf62a7)
