Revert D22369579: add eq.str, ne.str, and add.str ops
Test Plan: revert-hammer
Differential Revision:
D22369579 (https://github.com/pytorch/pytorch/commit/0deb2560b8b3c919115ec9302a781395838d97f7)
Original commit changeset: 7ac9a184d437
fbshipit-source-id: 9c861b9f6bf32fe51fa0ea516cf09a3d09d78a7c
