[nnc] Enable CPU fusion inside Facebook, take 4
Summary:
fixed the awkward configerator initialization issue that broke some
tests. Trying again
Test Plan: predictor comparisons
Reviewed By: ZolotukhinM
Differential Revision: D28859795
fbshipit-source-id: 826801db24e86b1c3594a86e3ac32f0a84c496f7
