[C++11] Add 'override' keyword to virtual methods that override their base class.

llvm-svn: 203339
diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h
index 2ff37e0..5e11dbb 100644
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h
@@ -117,13 +117,13 @@
     virtual MachineBasicBlock*
     EmitSchedule(MachineBasicBlock::iterator &InsertPos);
 
-    virtual void dumpNode(const SUnit *SU) const;
+    void dumpNode(const SUnit *SU) const override;
 
     void dumpSchedule() const;
 
-    virtual std::string getGraphNodeLabel(const SUnit *SU) const;
+    std::string getGraphNodeLabel(const SUnit *SU) const override;
 
-    virtual std::string getDAGName() const;
+    std::string getDAGName() const override;
 
     virtual void getCustomGraphFeatures(GraphWriter<ScheduleDAG*> &GW) const;