[NNC] Add cpu fusion gflag (#48682)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/48682
Reviewed By: Krovatkin, ngimel
Differential Revision: D25260205
Pulled By: eellison
fbshipit-source-id: df1655fd75f2a13bcf7c025b1f0a7becc2fd126a
