fix non-determinism
fix non-determinism

Summary: (Hopefully) Fix non-determinism

Reviewed By: emma0303

Differential Revision: D5014841

fbshipit-source-id: d766ceeb6672d7b2124b78d9efeff41608753f58

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