[PATCH] [InstCombineCompares] Added shl optimization for the instruction - icmp eq/ne (shl Const2, A), Const1

[Ankur Garg]

Hi David, 
Thanks for reviewing the patch.

I have renamed the variable 'Zeros' to 'AP2TrailingZeros' as per your comments.

Also, Can you please commit this patch, as I don't have commit access.

Thanks.

http://reviews.llvm.org/D5839

Files:
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/icmp.ll
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