Replace OVERRIDE->override and FINAL->final since we now require C++11.

src/compiler/machine-operator-reducer.h

Index: src/compiler/machine-operator-reducer.h
diff --git a/src/compiler/machine-operator-reducer.h b/src/compiler/machine-operator-reducer.h
index 7c41f143e20a9709761e1c783c88c06bd862e131..b0976b78d29e0771eecd99f5811bd4e6654af2bc 100644
--- a/src/compiler/machine-operator-reducer.h
+++ b/src/compiler/machine-operator-reducer.h
@@ -19,12 +19,12 @@ class JSGraph;
 
 // Performs constant folding and strength reduction on nodes that have
 // machine operators.
-class MachineOperatorReducer FINAL : public Reducer {
+class MachineOperatorReducer final : public Reducer {
  public:
   explicit MachineOperatorReducer(JSGraph* jsgraph);
   ~MachineOperatorReducer();
 
-  Reduction Reduce(Node* node) OVERRIDE;
+  Reduction Reduce(Node* node) override;
 
  private:
   Node* Float32Constant(volatile float value);