[PATCH] Added instcombine for 'ABS(ABS(X)) -> ABS(X)'

[Dinesh Dwivedi]

updated code to handle following patterns [Thanks for pointing out]
  // (X > 0) ? X : -X
  // (X < 0) ? -X : X
  // (X > 1) ? -X : X

http://reviews.llvm.org/D3658

Files:
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineSelect.cpp
  test/Transforms/InstCombine/select.ll
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