[PATCH] LowerSwitch: replace unreachable default with popular case destination

[Hans Wennborg]

> Yeah, that sounds like it!

>  This is exactly what I meant :)


Great! I've tidied up the patch a little, and made sure to use signed integers for IntRange since we're treating the case values as signed in the rest of the code.

Please take a look when you have time.


http://reviews.llvm.org/D6697

Files:
  lib/Transforms/Utils/LowerSwitch.cpp
  test/Transforms/LowerSwitch/2014-06-11-SwitchDefaultUnreachableOpt.ll
  test/Transforms/LowerSwitch/fold-popular-case-to-unreachable-default.ll

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