mozilla/rust — pull request #13055 by Aatch (2014-03-21 10:07:30+00:00)
Title: Remove trivial branches in with_cond

Removes branches on constant values when using with_cond, improving the
performance of non-optimized code and (hopefully) improving compile times.

This is a fairly simple front-end optimization.

@cmr if you could see if there is a measurable difference in compile times, that would be awesome