Move reconfiguration into the elements accessor

src/lookup.cc

Index: src/lookup.cc
diff --git a/src/lookup.cc b/src/lookup.cc
index 296d192083a76120b5e5a6697ae8822130f00495..716622b475de66d098dfa587ad8b467f47d01f6d 100644
--- a/src/lookup.cc
+++ b/src/lookup.cc
@@ -156,19 +156,12 @@ void LookupIterator::ReconfigureDataProperty(Handle<Object> value,
   DCHECK(HolderIsReceiverOrHiddenPrototype());
   Handle<JSObject> holder = GetHolder<JSObject>();
   if (IsElement()) {
-    // TODO(verwaest): Clean up.
-    DCHECK(holder->HasFastElements() || holder->HasDictionaryElements() ||
-           holder->HasSloppyArgumentsElements());
+    DCHECK(!holder->HasExternalArrayElements());
+    DCHECK(!holder->HasFixedTypedArrayElements());
     DCHECK(attributes != NONE || !holder->HasFastElements());
-    Handle<SeededNumberDictionary> d = JSObject::NormalizeElements(holder);
-    // TODO(verwaest): Move this into NormalizeElements.
-    d->set_requires_slow_elements();
-    if (holder->HasDictionaryElements()) {
-      JSObject::SetDictionaryElement(holder, index(), value, attributes);
-    } else {
-      JSObject::SetDictionaryArgumentsElement(holder, index(), value,
-                                              attributes);
-    }
+    Handle<FixedArrayBase> elements(holder->elements());
+    holder->GetElementsAccessor()->Reconfigure(holder, elements, number_, value,
+                                               attributes);
   } else if (holder_map_->is_dictionary_map()) {
     PropertyDetails details(attributes, v8::internal::DATA, 0,
                             PropertyCellType::kMutable);