[PATCH] [InstCombineAddSub] Transformation for the expression (X | Y) - X --> (~X & Y)

[Ankur Garg]

Added the test case. Forgot to include it in the last revision.

http://reviews.llvm.org/D5791

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