Decouple root visitors from object visitors.

src/builtins/builtins-api.cc

Index: src/builtins/builtins-api.cc
diff --git a/src/builtins/builtins-api.cc b/src/builtins/builtins-api.cc
index eb34638fa0b94ee00cd735007d3b39b8b29cd3bd..5ad518b8428c6637b99c5d05b4ec5a14d49d701f 100644
--- a/src/builtins/builtins-api.cc
+++ b/src/builtins/builtins-api.cc
@@ -11,6 +11,7 @@
 #include "src/log.h"
 #include "src/objects-inl.h"
 #include "src/prototype.h"
+#include "src/visitors.h"
 
 namespace v8 {
 namespace internal {
@@ -150,9 +151,10 @@ class RelocatableArguments : public BuiltinArguments, public Relocatable {
   RelocatableArguments(Isolate* isolate, int length, Object** arguments)
       : BuiltinArguments(length, arguments), Relocatable(isolate) {}
 
-  virtual inline void IterateInstance(ObjectVisitor* v) {
+  virtual inline void IterateInstance(RootVisitor* v) {
     if (length() == 0) return;
-    v->VisitPointers(lowest_address(), highest_address() + 1);
+    v->VisitRootPointers(Root::kRelocatable, lowest_address(),
+                         highest_address() + 1);
   }
 
  private: