[runtime] Follow-up fix for "Better encapsulation of dictionary objects handling in lookup iterator…

src/lookup.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/lookup.h"
 
 #include "src/bootstrapper.h"
 #include "src/deoptimizer.h"
 #include "src/elements.h"
 #include "src/field-type.h"
@@ skipping 338 matching lines @@
       transition_ = map;
     }
     return;
   }
 
   Handle<Map> transition =
       Map::TransitionToDataProperty(map, name_, value, attributes, store_mode);
   state_ = TRANSITION;
   transition_ = transition;
 
-  if (!transition->is_dictionary_map()) {
+  if (transition->is_dictionary_map()) {
+    // Don't set enumeration index (it will be set during value store).
+    property_details_ =
+        PropertyDetails(attributes, i::DATA, 0, PropertyCellType::kNoCell);
+  } else {
     property_details_ = transition->GetLastDescriptorDetails();
     has_property_ = true;
   }
 }
 
 void LookupIterator::ApplyTransitionToDataProperty(Handle<JSObject> receiver) {
   DCHECK_EQ(TRANSITION, state_);
 
   DCHECK(receiver.is_identical_to(GetStoreTarget()));
   holder_ = receiver;
@@ skipping 457 matching lines @@
                                       : access_check_info->named_interceptor();
     if (interceptor) {
       return handle(InterceptorInfo::cast(interceptor), isolate_);
     }
   }
   return Handle<InterceptorInfo>();
 }
 
 }  // namespace internal
 }  // namespace v8