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

[David Majnemer]

You have a lot of logic in here that could easily live in InstSimplify, please move appropriate code into the InstructionSimplify analysis code in a separate differential.

http://reviews.llvm.org/D5518