mozilla/rust — pull request #10113 by thestinger (2013-10-28 00:55:07+00:00)
Title: mark bounds check failures as the cold path

LLVM is unable to determine this for most cases.

http://llvm-reviews.chandlerc.com/D2034 needs to land upstream before
this is going to have an effect. It's harmless to start generating the
expect hint now.