Handle pre-allocated properties when copying map

src/runtime.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 4355 matching lines @@
       // allocate JSFunctions since it does not properly initialize
       // the shared part of the function. Since the receiver is
       // ignored anyway, we use the global object as the receiver
       // instead of a new JSFunction object. This way, errors are
       // reported the same way whether or not 'Function' is called
       // using 'new'.
       return Top::context()->global();
     }
   }
 
+  // The function should be compiled for the optimization hints to be available.
+  if (!function->shared()->is_compiled()) {
+     CompileLazyShared(Handle<SharedFunctionInfo>(function->shared()),
+                                                  CLEAR_EXCEPTION,
+                                                  0);
+  }
+
   bool first_allocation = !function->has_initial_map();
   Handle<JSObject> result = Factory::NewJSObject(function);
   if (first_allocation) {
     Handle<Map> map = Handle<Map>(function->initial_map());
     Handle<Code> stub = ComputeConstructStub(map);
     function->shared()->set_construct_stub(*stub);
   }
   Counters::constructed_objects.Increment();
   Counters::constructed_objects_runtime.Increment();
   return *result;
@@ skipping 3246 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal