Decouple root visitors from object visitors.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 42b2b18ad10db4fe5fe286a027837855a76b4464..ad6e20cc5a73c8f6958a3e2b492c7fcdf910211f 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -16,6 +16,7 @@
 #include "src/log.h"
 #include "src/objects.h"
 #include "src/setup-isolate.h"
+#include "src/visitors.h"
 
 namespace v8 {
 namespace internal {
@@ -109,14 +110,14 @@ size_t Interpreter::GetDispatchTableIndex(Bytecode bytecode,
   return 0;
 }
 
-void Interpreter::IterateDispatchTable(ObjectVisitor* v) {
+void Interpreter::IterateDispatchTable(RootVisitor* v) {
   for (int i = 0; i < kDispatchTableSize; i++) {
     Address code_entry = dispatch_table_[i];
     Object* code = code_entry == nullptr
                        ? nullptr
                        : Code::GetCodeFromTargetAddress(code_entry);
     Object* old_code = code;
-    v->VisitPointer(&code);
+    v->VisitRootPointer(Root::kDispatchTable, &code);
     if (code != old_code) {
       dispatch_table_[i] = reinterpret_cast<Code*>(code)->entry();
     }