[PATCH] Added instruction combine to transform few more negative values addition to subtraction

[Dinesh Dwivedi]

Closed by commit rL211266 (authored by dinesh).

http://reviews.llvm.org/D3733

Files:
  llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/trunk/test/Transforms/InstCombine/add2.ll
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