[PATCH] [InstCombineAddSub] Added the transformation - "sub (or A B) (xor A B) -> (and A B)"

[Ankur Garg]

Hi David,

Thanks for the comments.
You are right. I think I should run LLVM test suite and find out how many times, does this case actually arise. 

Thanks.

http://reviews.llvm.org/D5719