[X86] SimplifyDemandedVectorElts - attempt to recombine target shuffle using Demanded...

[X86] SimplifyDemandedVectorElts - attempt to recombine target shuffle using DemandedElts mask (reapplied)

If we don't demand all elements, then attempt to combine to a simpler shuffle.

At the moment we can only do this if Depth == 0 as combineX86ShufflesRecursively uses Depth to track whether the shuffle has really changed or not - we'll need to change this before we can properly start merging combineX86ShufflesRecursively into SimplifyDemandedVectorElts.

The insertps-combine.ll regression is because XFormVExtractWithShuffleIntoLoad can't see through shuffles of different widths - this will be fixed in a follow-up commit.

Reapplying this as rL368307 had to be reverted as part of rL368660 to revert rL368276

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368662 91177308-0d34-0410-b5e6-96231b3b80d8