[nnc] Enable CPU fusion (#63545)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/63545
Test Plan: Imported from OSS
Reviewed By: navahgar
Differential Revision: D30417370
Pulled By: bertmaher
fbshipit-source-id: 84ce7a578a3678d5562bab99d1dc00330c4f72d1
