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

[Dinesh Dwivedi]

Updated patch to return fully transformed value.

Added additional transforms
  (x + (~(y | c) + 1)   -->   x - (y | c) if c is even
  (x + (~((y >> z) | c) + 1)   -->   x - ((y>>z) | c)  if c is even

Is it ok to loose names of instruction during transforms. This patch returns instruction names as %1, %2

http://reviews.llvm.org/D3733

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