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

[Dinesh Dwivedi]

Removed hasOneUse() check and updated test cases. This patch takes care of PR14365

http://reviews.llvm.org/D3733

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