[PATCH] Switch to Select optimisations

[Marcello Maggioni]

I addressed all Hans comments with the exception of using a DenseMap instead of a SmallVector for the results and splitting the bit patterns in a separate patch for now.

http://reviews.llvm.org/D5525

Files:
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/UnreachableEliminate.ll
  test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll
  test/Transforms/SimplifyCFG/switch-to-select-bitpattern.ll
  test/Transforms/SimplifyCFG/switch-to-select-range.ll
  test/Transforms/SimplifyCFG/switch-to-select-two-case.ll
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