[turbofan] Cleanup use of virtual, OVERRIDE, FINAL.

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/bootstrapper.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 120 matching lines @@
 
   Factory* factory() const { return isolate()->factory(); }
   Isolate* isolate() const { return zone()->isolate(); }
   Zone* zone() const { return zone_; }
 
   Type* cache_[kNumLazyCachedTypes];
   Zone* zone_;
 };
 
 
-class Typer::Decorator : public GraphDecorator {
+class Typer::Decorator FINAL : public GraphDecorator {
  public:
   explicit Decorator(Typer* typer) : typer_(typer) {}
-  virtual void Decorate(Node* node);
+  void Decorate(Node* node) FINAL;
 
  private:
   Typer* typer_;
 };
 
 
 Typer::Typer(Graph* graph, MaybeHandle<Context> context)
     : graph_(graph),
       context_(context),
       decorator_(NULL),
@@ skipping 1942 matching lines @@
         // TODO(rossberg): Do we want some ClampedArray type to express this?
         break;
     }
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8