Remove region-tracelet inlining assert

Summary: It's firing on what are beleived to be normal situations,
which isn't what asserts are for.

Reviewed By: @markw65, @alexmalyshev

Differential Revision: D1652666
Raise warnings in ext/std/file functions [closes #3635, closes #2999]

Summary: Closes https://github.com/facebook/hhvm/pull/3897

Reviewed By: @ptarjan

Differential Revision: D1592143

Signature: t1:1592143:1414812285:1dffc5f5c2a5583cced2e702630a7e911ec7509d