[PATCH] Switch to Select range optimization

[Marcello Maggioni]

Hi hans,

This is a follow up for http://reviews.llvm.org/D5620 .

This optimization tries one step further trying to detect cases where we can use a pivot to distinguish between the two case groups.

At the moment if the optimization detects that a default target is present in the switch it bails out, but it tries to see if that default can trigger or not.

http://reviews.llvm.org/D6269

Files:
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/switch-to-select-range.ll
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