Revert "[X86][AVX] Convert X86ISD::VBROADCAST demanded elts combine to use SimplifyDemandedVectorElts"

This reverts commit r337547. It triggers an infinite loop.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337617 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed