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

[Marcello Maggioni]

I'm attaching the graphs of the test case lowered through lowerswitch with and without the patch to give context to what I mean:

F305413: with_patch.jpg <http://reviews.llvm.org/F305413>

F305415: without_patch.jpg <http://reviews.llvm.org/F305415>


http://reviews.llvm.org/D6697

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