misched preparation: modularize schedule printing.

ScheduleDAG will not refer to the scheduled instruction sequence.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152205 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
index 1e5146e..caab4c6 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
@@ -621,6 +621,15 @@
   }
 }
 
+void ScheduleDAGSDNodes::dumpSchedule() const {
+  for (unsigned i = 0, e = Sequence.size(); i != e; i++) {
+    if (SUnit *SU = Sequence[i])
+      SU->dump(this);
+    else
+      dbgs() << "**** NOOP ****\n";
+  }
+}
+
 #ifndef NDEBUG
 /// VerifyScheduledSequence - Verify that all SUnits were scheduled and that
 /// their state is consistent with the nodes listed in Sequence.