[X86][SSE] Revert rL343922 combinePMULDQ AddToWorklist (PR39398)

We can't add the MULDQ node back to the worklist after the demanded bits change has been committed in case the node has been removed entirely. This will have to wait until we have SimplifyDemandedBitsForTargetNode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345070 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed