Implement tracking and optimizations of packed arrays

src/api.cc

 // Copyright 2012 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 5022 matching lines @@
   } else {
     return static_cast<uint32_t>(length->Number());
   }
 }
 
 
 Local<Object> Array::CloneElementAt(uint32_t index) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Array::CloneElementAt()", return Local<Object>());
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
-  if (!self->HasFastElements()) {
+  if (!self->HasFastObjectElements()) {
     return Local<Object>();
   }
   i::FixedArray* elms = i::FixedArray::cast(self->elements());
   i::Object* paragon = elms->get(index);
   if (!paragon->IsJSObject()) {
     return Local<Object>();
   }
   i::Handle<i::JSObject> paragon_handle(i::JSObject::cast(paragon));
   EXCEPTION_PREAMBLE(isolate);
   ENTER_V8(isolate);
@@ skipping 1357 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* scope_implementer =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   scope_implementer->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal