Revert D27652484: [nnc] Enable CPU fusion inside Facebook
Test Plan: revert-hammer
Differential Revision:
D27652484 (https://github.com/pytorch/pytorch/commit/ac04cc775bc1cc7e85e7bbc8a54744720fe7c068)
Original commit changeset: a82681455dae
fbshipit-source-id: ecfef3ee1e7197148b172234691e72faf4b95cf8
