Summary:
Two fixes included in this one. The debug flag is obvious, the annotations
less so. I'll try and find the right place to document this, but the reason
we need this here is because we reflect on `Prop.class`, so these need to be
available at runtime.
Reviewed By: jknoxville
Differential Revision: D9766713
fbshipit-source-id: 269b5a60c0df644f4fda0ea289ef9dc392ee352b
c495c53cd4