Revert "[DAG, X86] Revert r327197 "Revert r327170, r327171, r327172""

as it times out building test-suite on PPC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327778 91177308-0d34-0410-b5e6-96231b3b80d8
24 files changed