[PATCH] [Reassociate] Similar to "X + -X" -> "0", added code to handle "X + ~X" -> "-1".

[Rahul Jain]

Hi bkramer, rafael, majnemer,


Handle "X + ~X" -> "-1" in the function Value *Reassociate::OptimizeAdd(Instruction *I, SmallVectorImpl<ValueEntry> &Ops);
This patch implements:
TODO: We could handle "X + ~X" -> "-1" if we wanted, since "-X = ~X+1".

http://reviews.llvm.org/D3835

Files:
  lib/Transforms/Scalar/Reassociate.cpp
  test/Transforms/Reassociate/inverses.ll
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