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

[Hans Wennborg]

Updating the patch to handle the situation where all cases get moved to the default, and simplifying the code a little.


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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