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>
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