If we are trimming the whole array, just return the empty fixed array.

src/handles.cc

 // Copyright 2012 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 781 matching lines @@
     // many properties were added but subsequently deleted.
     int next_enumeration = dictionary->NextEnumerationIndex();
     if (next_enumeration > (length * 3) / 2) {
       StringDictionary::DoGenerateNewEnumerationIndices(dictionary);
       next_enumeration = dictionary->NextEnumerationIndex();
     }
 
     Handle<FixedArray> storage =
         isolate->factory()->NewFixedArray(next_enumeration);
 
-    dictionary->CopyEnumKeysTo(*storage);
+    storage = Handle<FixedArray>(dictionary->CopyEnumKeysTo(*storage));
     ASSERT(storage->length() == object->NumberOfLocalProperties(DONT_ENUM));
     return storage;
   }
 }
 
 
 Handle<ObjectHashSet> ObjectHashSetAdd(Handle<ObjectHashSet> table,
                                        Handle<Object> key) {
   CALL_HEAP_FUNCTION(table->GetIsolate(),
                      table->Add(*key),
@@ skipping 213 matching lines @@
   data->next = prev_next_;
   data->limit = prev_limit_;
 #ifdef DEBUG
   handles_detached_ = true;
 #endif
   return deferred;
 }
 
 
 } }  // namespace v8::internal