Decouple root visitors from object visitors.

src/interpreter/interpreter.h

 // Copyright 2015 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_INTERPRETER_INTERPRETER_H_
 #define V8_INTERPRETER_INTERPRETER_H_
 
 #include <memory>
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
 // Do not include anything from src/interpreter other than
 // src/interpreter/bytecodes.h here!
 #include "src/base/macros.h"
 #include "src/builtins/builtins.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/parsing/token.h"
 #include "src/runtime/runtime.h"
 
 namespace v8 {
 namespace internal {
 
 class Isolate;
 class Callable;
 class CompilationInfo;
 class CompilationJob;
 class SetupIsolateDelegate;
+class RootVisitor;
 
 namespace interpreter {
 
 class InterpreterAssembler;
 
 class Interpreter {
  public:
   explicit Interpreter(Isolate* isolate);
   virtual ~Interpreter() {}
 
   // Returns the interrupt budget which should be used for the profiler counter.
   static int InterruptBudget();
 
   // Creates a compilation job which will generate bytecode for |info|.
   static CompilationJob* NewCompilationJob(CompilationInfo* info);
 
   // Return bytecode handler for |bytecode|.
   Code* GetBytecodeHandler(Bytecode bytecode, OperandScale operand_scale);
 
   // GC support.
-  void IterateDispatchTable(ObjectVisitor* v);
+  void IterateDispatchTable(RootVisitor* v);
 
   // Disassembler support (only useful with ENABLE_DISASSEMBLER defined).
   const char* LookupNameOfBytecodeHandler(Code* code);
 
   V8_EXPORT_PRIVATE Local<v8::Object> GetDispatchCountersObject();
 
   Address dispatch_table_address() {
     return reinterpret_cast<Address>(&dispatch_table_[0]);
   }
 
@@ skipping 25 matching lines @@
   std::unique_ptr<uintptr_t[]> bytecode_dispatch_counters_table_;
 
   DISALLOW_COPY_AND_ASSIGN(Interpreter);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_INTERPRETER_H_