Move public symbols to the root set.

src/ast-value-factory.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 164 matching lines @@
 
 
 void AstValue::Internalize(Isolate* isolate) {
   switch (type_) {
     case STRING:
       DCHECK(string_ != NULL);
       // Strings are already internalized.
       DCHECK(!string_->string().is_null());
       break;
     case SYMBOL:
-      value_ = Object::GetProperty(
-                   isolate, handle(isolate->native_context()->builtins()),
-                   symbol_name_).ToHandleChecked();
+      DCHECK_EQ(0, strcmp(symbol_name_, "iterator_symbol"));
+      value_ = isolate->factory()->iterator_symbol();
       break;
     case NUMBER:
       value_ = isolate->factory()->NewNumber(number_, TENURED);
       break;
     case SMI:
       value_ = handle(Smi::FromInt(smi_), isolate);
       break;
     case BOOLEAN:
       if (bool_) {
         value_ = isolate->factory()->true_value();
@@ skipping 181 matching lines @@
     if (isolate_) {
       new_string->Internalize(isolate_);
     }
     entry->value = reinterpret_cast<void*>(1);
   }
   return reinterpret_cast<AstRawString*>(entry->key);
 }
 
 
 } }  // namespace v8::internal