Decouple root visitors from object visitors.

src/builtins/builtins.cc

 // Copyright 2012 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/builtins/builtins.h"
 #include "src/api.h"
 #include "src/assembler-inl.h"
 #include "src/builtins/builtins-descriptors.h"
 #include "src/callable.h"
 #include "src/isolate.h"
 #include "src/macro-assembler.h"
 #include "src/objects-inl.h"
+#include "src/visitors.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations for C++ builtins.
 #define FORWARD_DECLARE(Name) \
   Object* Builtin_##Name(int argc, Object** args, Isolate* isolate);
 BUILTIN_LIST_C(FORWARD_DECLARE)
 
 Builtins::Builtins() : initialized_(false) {
   memset(builtins_, 0, sizeof(builtins_[0]) * builtin_count);
 }
 
 Builtins::~Builtins() {}
 
 void Builtins::TearDown() { initialized_ = false; }
 
-void Builtins::IterateBuiltins(ObjectVisitor* v) {
-  v->VisitPointers(&builtins_[0], &builtins_[0] + builtin_count);
+void Builtins::IterateBuiltins(RootVisitor* v) {
+  v->VisitRootPointers(Root::kBuiltins, &builtins_[0],
+                       &builtins_[0] + builtin_count);
 }
 
 const char* Builtins::Lookup(byte* pc) {
   // may be called during initialization (disassembler!)
   if (initialized_) {
     for (int i = 0; i < builtin_count; i++) {
       Code* entry = Code::cast(builtins_[i]);
       if (entry->contains(pc)) return name(i);
     }
   }
@@ skipping 199 matching lines @@
   // TODO(jochen): Remove this.
   if (responsible_context.is_null()) {
     return true;
   }
   if (*responsible_context == target->context()) return true;
   return isolate->MayAccess(responsible_context, target_global_proxy);
 }
 
 }  // namespace internal
 }  // namespace v8