[PATCH] [SwitchLowering] Handle multiple destinations on condensed case stmts

[Bruno Cardoso Lopes]

Hi ributzka, grosbach, marcello.maggioni,

Switch cases statements with sequential values that branch to the same
destination BB may often be handled together in a single new source
BB. In this scenario we need to remove remaining incoming values from
PHI instructions in the destination BB, as to match the number of source
branches.

http://reviews.llvm.org/D6415

Files:
  lib/Transforms/Utils/LowerSwitch.cpp
  test/Transforms/Util/lowerswitch.ll
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