Add a test case for issue 618

src/objects.cc

 // Copyright 2006-2009 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 4827 matching lines @@
     ASSERT(prototype->IsNull());
     return true;
   }
 
   // Traverse the proposed prototype chain looking for setters for properties of
   // the same names as are set by the inline constructor.
   for (Object* obj = prototype;
        obj != Heap::null_value();
        obj = obj->GetPrototype()) {
     JSObject* js_object = JSObject::cast(obj);
-    if (!js_object->HasFastProperties()) {
-      // Only allow fast case objects, as the map check in the inline
-      // constructor which check for changes to the prototype chain cannot
-      // handle dictionary case objects.
-      return false;
-    }
     for (int i = 0; i < this_property_assignments_count(); i++) {
       LookupResult result;
       String* name = GetThisPropertyAssignmentName(i);
       js_object->LocalLookupRealNamedProperty(name, &result);
       if (result.IsValid() && result.type() == CALLBACKS) {
         return false;
       }
     }
   }
 
@@ skipping 3522 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal