[racerd] precondition -> snapshot
[racerd] precondition -> snapshot

Reviewed By: ngorogiannis

Differential Revision: D7754774

fbshipit-source-id: 5d04c60

jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer