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41cf5a1b - Add backend optimus

Add backend optimus Summary: X-link: https://github.com/pytorch/pytorch/pull/167357 `--optimus [all | vertical_opt | horizontal_opt]` will kick off inductor compile with different fusion strategies. Reviewed By: mengluy0125 Differential Revision: D86524903 fbshipit-source-id: 2b984f31080de1e8c7434f774f10356527b02cc7