[PATCH] shl Optimization InstCombine

[sonam kumari]

Hi rafael, dexonsmith, nicholas,

This patch handles 
(icmp eq/ne (shl const2, A), const1) -> (icmp eq/ne A, log2(const1) - log2(const2)).
I wrote this patch for the equality comparison.
For other comparison operators, it needs to handled.
In the test cases I considered all the boundary conditions for the 32 bit integer and handled them.

Please help in reviewing this patch.
Any comments/suggestions are most welcomed.

Thanks,
Sonam.

http://reviews.llvm.org/D4553

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