Refactor prototype setting code and expose SetPrototype to public V8 API.

src/handles.cc

 // Copyright 2009 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 282 matching lines @@
                      Object);
 }
 
 
 Handle<Object> GetPrototype(Handle<Object> obj) {
   Handle<Object> result(obj->GetPrototype());
   return result;
 }
 
 
+Handle<Object> SetPrototype(Handle<JSObject> obj, Handle<Object> value) {
+  const bool skip_hidden_prototypes = false;
+  CALL_HEAP_FUNCTION(obj->SetPrototype(*value, skip_hidden_prototypes), Object);
+}
+
+
 Handle<Object> GetHiddenProperties(Handle<JSObject> obj,
                                    bool create_if_needed) {
   Object* holder = obj->BypassGlobalProxy();
   if (holder->IsUndefined()) return Factory::undefined_value();
   obj = Handle<JSObject>(JSObject::cast(holder));
 
   if (obj->HasFastProperties()) {
     // If the object has fast properties, check whether the first slot
     // in the descriptor array matches the hidden symbol. Since the
     // hidden symbols hash code is zero (and no other string has hash
@@ skipping 509 matching lines @@
   Handle<Map> new_map = Factory::CopyMapDropTransitions(old_map);
   obj->set_map(*new_map);
   new_map->set_needs_loading(true);
   // Store the lazy loading info in the constructor field.  We'll
   // reestablish the constructor from the fixed array after loading.
   new_map->set_constructor(*arr);
   ASSERT(!obj->IsLoaded());
 }
 
 } }  // namespace v8::internal