Remove redundant code in InstCombineShift, no functionality change because instsimplify already does this and instcombine calls instsimplify a few lines above. Patch by Suyog Sarda!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211250 91177308-0d34-0410-b5e6-96231b3b80d8