Summary:
This takes about 4.5s on my laptop. By moving it to its own file, we can run it in parallel and save from the total check-code time.
Laptop: 31.74s -> 25.53s
Devserver: 24.5s -> 22.21s
Reviewed By: quark-zju
Differential Revision: D8721156
fbshipit-source-id: 6d4d2c86517239f1762a413bc5d3dfefe184eaca