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

llvm-svn: 203220
diff --git a/llvm/lib/CodeGen/VirtRegMap.cpp b/llvm/lib/CodeGen/VirtRegMap.cpp
index 7d6481a..f87c8b0 100644
--- a/llvm/lib/CodeGen/VirtRegMap.cpp
+++ b/llvm/lib/CodeGen/VirtRegMap.cpp
@@ -169,9 +169,9 @@
   static char ID;
   VirtRegRewriter() : MachineFunctionPass(ID) {}
 
-  virtual void getAnalysisUsage(AnalysisUsage &AU) const;
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
 
-  virtual bool runOnMachineFunction(MachineFunction&);
+  bool runOnMachineFunction(MachineFunction&) override;
 };
 } // end anonymous namespace