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

llvm-svn: 203220
diff --git a/llvm/lib/CodeGen/MachineTraceMetrics.cpp b/llvm/lib/CodeGen/MachineTraceMetrics.cpp
index 41cf1ea..b10e778 100644
--- a/llvm/lib/CodeGen/MachineTraceMetrics.cpp
+++ b/llvm/lib/CodeGen/MachineTraceMetrics.cpp
@@ -302,9 +302,9 @@
 // instructions.
 namespace {
 class MinInstrCountEnsemble : public MachineTraceMetrics::Ensemble {
-  const char *getName() const { return "MinInstr"; }
-  const MachineBasicBlock *pickTracePred(const MachineBasicBlock*);
-  const MachineBasicBlock *pickTraceSucc(const MachineBasicBlock*);
+  const char *getName() const override { return "MinInstr"; }
+  const MachineBasicBlock *pickTracePred(const MachineBasicBlock*) override;
+  const MachineBasicBlock *pickTraceSucc(const MachineBasicBlock*) override;
 
 public:
   MinInstrCountEnsemble(MachineTraceMetrics *mtm)