faster
faster

Summary:
This combines various micro-optimizations to speed up BranchPrefixHoisting.

This is a behavior-preserving change.

Reviewed By: yuxuanchen1997

Differential Revision: D35866159

fbshipit-source-id: 60df4ac451fcb9a9751a1d4eea384b2384405ff9

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex