Updated load_model_test to allocate rigid body system on the heap to ensure it is 16-bit aligned. Updated comment.
Updated load_model_test to allocate rigid body system on the heap to ensure it is 16-bit aligned. Updated comment.

billhoffman/drake,billhoffman/drake,sheim/drake,sheim/drake,billhoffman/drake,billhoffman/drake,sheim/drake,billhoffman/drake,billhoffman/drake,sheim/drake,sheim/drake,billhoffman/drake,sheim/drake,billhoffman/drake,sheim/drake,sheim/drake