[DAG, X86] Revert r324797, r324491, and r324359.
Sadly, r324359 caused at least PR36312. There is a patch out for review
but it seems to be taking a bit and we've already had these crashers in
tree for too long. We're hitting this PR in real code now and are
blocked on shipping new compilers as a consequence so I'm reverting us
back to green.
Sorry for the churn due to the stacked changes that I had to revert. =/
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325420 91177308-0d34-0410-b5e6-96231b3b80d8
18 files changed