[X86][SSE] Split SimplifyDemandedBitsForTargetNode X86ISD::VSRLI/VSRAI handling.

First step towards adding more capable combines to fix comments in D55768.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349400 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed