[PATCH] Expand SimplifyCFG to convert certain simple switches to selects

[Marcello Maggioni]

Modified to move some work into helper functions to improve readability

http://reviews.llvm.org/D4219

Files:
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/2014-06-19-SwitchToSelectBitPattern.ll
  test/Transforms/SimplifyCFG/2014-06-19-SwitchToSelectRange.ll
  test/Transforms/SimplifyCFG/2014-06-19-SwitchToSelectTwoCase.ll
  test/Transforms/SimplifyCFG/UnreachableEliminate.ll
  test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll
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