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

src/compiler/js-generic-lowering.h

 // 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.
 
 #ifndef V8_COMPILER_JS_GENERIC_LOWERING_H_
 #define V8_COMPILER_JS_GENERIC_LOWERING_H_
 
 #include "src/allocation.h"
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Forward declarations.
 class CommonOperatorBuilder;
 class MachineOperatorBuilder;
 class Linkage;
 
+
 // Lowers JS-level operators to runtime and IC calls in the "generic" case.
-class JSGenericLowering : public Reducer {
+class JSGenericLowering FINAL : public Reducer {
  public:
   JSGenericLowering(CompilationInfo* info, JSGraph* graph);
-  virtual ~JSGenericLowering() {}
+  ~JSGenericLowering() FINAL {}
 
-  virtual Reduction Reduce(Node* node);
+  Reduction Reduce(Node* node) FINAL;
 
  protected:
 #define DECLARE_LOWER(x) void Lower##x(Node* node);
   // Dispatched depending on opcode.
   JS_OP_LIST(DECLARE_LOWER)
 #undef DECLARE_LOWER
 
   // Helpers to patch existing nodes in the graph.
   void PatchOperator(Node* node, const Operator* new_op);
   void PatchInsertInput(Node* node, int index, Node* input);
@@ skipping 20 matching lines @@
   CompilationInfo* info_;
   JSGraph* jsgraph_;
   Linkage* linkage_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_GENERIC_LOWERING_H_