pytorch

ad17fadb - Revert D27652485: [nnc] Enable CPU fusion only when num_threads == 1

Revert D27652485: [nnc] Enable CPU fusion only when num_threads == 1 Test Plan: revert-hammer Differential Revision: D27652485 (https://github.com/pytorch/pytorch/commit/e7e164f9e67d100a192f6f29709b9331b4265b1f) Original commit changeset: 182580cf758d fbshipit-source-id: e3c95b06d1eef668095f3cf461485395179d94af