Cleanup typed array setters, the property is guaranteed to be there.

src/lookup.cc

Index: src/lookup.cc
diff --git a/src/lookup.cc b/src/lookup.cc
index b91ad4c9f4bb9ec1b12db7e548bfac0fe27e2fc0..29c54819fcde8f85b1a7f15e752262be8755083a 100644
--- a/src/lookup.cc
+++ b/src/lookup.cc
@@ -176,7 +176,7 @@ void LookupIterator::ReconfigureDataProperty(Handle<Object> value,
     if (attributes == NONE && !holder->HasDictionaryElements() &&
         !holder->HasDictionaryArgumentsElements()) {
       ElementsAccessor* accessor = holder->GetElementsAccessor();
-      accessor->Set(holder, index(), value);
+      accessor->Set(handle(holder->elements()), index(), value);
     } else {
       DCHECK(holder->HasFastElements() || holder->HasDictionaryElements() ||
              holder->HasSloppyArgumentsElements());
@@ -424,7 +424,7 @@ void LookupIterator::WriteDataValue(Handle<Object> value) {
   Handle<JSObject> holder = GetHolder<JSObject>();
   if (IsElement()) {
     ElementsAccessor* accessor = holder->GetElementsAccessor();
-    accessor->Set(holder, index_, value);
+    accessor->Set(handle(holder->elements()), index_, value);
   } else if (holder->IsGlobalObject()) {
     Handle<GlobalDictionary> property_dictionary =
         handle(holder->global_dictionary());