Simplify a bit by storing the `EventNotifier` objects directly in the `std::map` instead of wrapping them in unique_ptr. An other advantage is that it removes one allocation per fence. Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>