Revert of [runtime] Do not use the enum-cache for non-prototype objects.

src/elements.cc

 // Copyright 2012 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/elements.h"
 
 #include "src/arguments.h"
 #include "src/conversions.h"
 #include "src/factory.h"
 #include "src/messages.h"
@@ skipping 1135 matching lines @@
       uint32_t index = static_cast<uint32_t>(k->Number());
       if (index < offset) continue;
       PropertyDetails details = dictionary->DetailsAt(i);
       if (filter & ONLY_ALL_CAN_READ) {
         if (details.kind() != kAccessor) continue;
         Object* accessors = dictionary->ValueAt(i);
         if (!accessors->IsAccessorInfo()) continue;
         if (!AccessorInfo::cast(accessors)->all_can_read()) continue;
       }
       PropertyAttributes attr = details.attributes();
-      if ((attr & filter) != 0) {
-        if (attr & PropertyAttributes::DONT_ENUM) {
-          keys->HideKey(index);
-        }
-        continue;
-      }
+      if ((attr & filter) != 0) continue;
       keys->AddKey(index);
     }
 
     keys->SortCurrentElementsList();
   }
 };
 
 
 // Super class for all fast element arrays.
 template<typename FastElementsAccessorSubclass,
@@ skipping 1248 matching lines @@
     }
   }
 
   DCHECK(j == result_len);
   return result_array;
 }
 
 ElementsAccessor** ElementsAccessor::elements_accessors_ = NULL;
 }  // namespace internal
 }  // namespace v8