[PATCH] Branch folding causes different code generation at "-O2 -g" and "-O2"

[Chandler Carruth]

  Gah.

  Fully stubbing out the debug info doesn't work because we do a bunch of other optimization passes in llc when we only want to test one thing. :: sigh ::

  Anyways, LGTM.

http://llvm-reviews.chandlerc.com/D2970