Int8 FC performance debugging (#17700)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17700
Add performance debugging utilities in DNNLOWP FC operator and the python script
Reviewed By: amylittleyang
Differential Revision: D14321299
fbshipit-source-id: 50dbd7b352a1da5d2ecb659d8003e71e70750063
