[nullsafe] Respect RecentlyNonNull annotation
[nullsafe] Respect RecentlyNonNull annotation

Summary:
See comment in the code.
Similarly to what we are already doing with RecentlyNullable, we should
treat this annotation exactly like NonNull.

Reviewed By: artempyanykh

Differential Revision: D20219284

fbshipit-source-id: 01f1127a6

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