[PATCH] Added InstCombine transform for pattern " ((X % Z) + (Y % Z)) % Z -> (X + Y) % Z ".

[Ankur Garg]

Hi David,
I have made the changes as per your comments. I have made sure that the I isn't mutated and also added CHECK statements for the test cases.
Please review the updated revision.

Thanks.

http://reviews.llvm.org/D5351

Files:
  lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
  test/Transforms/InstCombine/rem.ll
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