Track IR ordering of SelectionDAG nodes 3/4.

Remove the old IR ordering mechanism and switch to new one.  Fix unit
test failures.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182704 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
index b22440d..a5de9db 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
@@ -736,7 +736,7 @@
                            DenseMap<SDValue, unsigned> &VRBaseMap,
                     SmallVector<std::pair<unsigned, MachineInstr*>, 32> &Orders,
                            SmallSet<unsigned, 8> &Seen) {
-  unsigned Order = DAG->GetOrdering(N);
+  unsigned Order = N->getIROrder();
   if (!Order || !Seen.insert(Order)) {
     // Process any valid SDDbgValues even if node does not have any order
     // assigned.