Fix garbage collection of unused maps. Null descriptors, created...

src/handles.cc

 // Copyright 2006-2008 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 449 matching lines @@
       DescriptorArray* desc = object->map()->instance_descriptors();
       return Handle<FixedArray>(FixedArray::cast(desc->GetEnumCache()));
     }
     Counters::enum_cache_misses.Increment();
     int num_enum = object->NumberOfEnumProperties();
     Handle<FixedArray> storage = Factory::NewFixedArray(num_enum);
     Handle<FixedArray> sort_array = Factory::NewFixedArray(num_enum);
     for (DescriptorReader r(object->map()->instance_descriptors());
          !r.eos();
          r.advance()) {
-      if (!r.IsTransition() && !r.IsDontEnum()) {
+      if (r.IsProperty() && !r.IsDontEnum()) {
         (*storage)->set(index, r.GetKey());
         (*sort_array)->set(index, Smi::FromInt(r.GetDetails().index()));
         index++;
       }
     }
     (*storage)->SortPairs(*sort_array);
     Handle<FixedArray> bridge_storage =
         Factory::NewFixedArray(DescriptorArray::kEnumCacheBridgeLength);
     DescriptorArray* desc = object->map()->instance_descriptors();
     desc->SetEnumCache(*bridge_storage, *storage);
@@ skipping 122 matching lines @@
                Handle<Context> compile_context,
                Handle<Context> function_context) {
   Handle<FixedArray> arr = Factory::NewFixedArray(3);
   arr->set(0, Smi::FromInt(index));
   arr->set(1, *compile_context);  // Compile in this context
   arr->set(2, *function_context);  // Set function context to this
   fun->shared()->set_lazy_load_data(*arr);
 }
 
 } }  // namespace v8::internal