Release build: guard dump functions with "ifndef NDEBUG"

No functional change.

llvm-svn: 163339
diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
index c25f39d..2d8f235 100644
--- a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -1012,7 +1012,9 @@
 }
 
 void ScheduleDAGInstrs::dumpNode(const SUnit *SU) const {
+#ifndef NDEBUG
   SU->getInstr()->dump();
+#endif
 }
 
 std::string ScheduleDAGInstrs::getGraphNodeLabel(const SUnit *SU) const {