[PATCH] Added InstCombine transformation for combining two instructions icmp slt/sle/ult/ule/sge/sgt/uge/ugt (ashr/lshr (Const2) %A), (Const1)

[Ankur Garg]

Hi David,
All of the logic movable to InstSimplify was already present there. I have removed most of such logic from this function.
Remaining logic is quite specific to certain cases and I have left it as it is, just to avoid confusion in understanding the other cases. Though, it is already being handled in InstSimplify.


Please help in reviewing the updated revision.
Thanks.

http://reviews.llvm.org/D5518

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