aco: create acq+rel barriers instead of acq/rel

NIR doesn't have atomic loads/stores, so we have to workaround that with
this for dEQP-VK.memory_model.* to pass.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4905>
1 file changed