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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203344 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ExecutionEngine/ObjectBuffer.h

@@ -56,7 +56,7 @@ protected:
 /// while providing a common ObjectBuffer interface for access to the
 /// memory once the object has been generated.
 class ObjectBufferStream : public ObjectBuffer {
-  virtual void anchor();
+  void anchor() override;
 public:
   ObjectBufferStream() : OS(SV) {}
   virtual ~ObjectBufferStream() {}