WIP: anv: add end of sync operation before barrier

We need to make sure work has completed before doing the barrier (especially with resolve operations).

The current barrier code is pretty clumsy, we need to rework it. This change is more a short term fix before we can do something better.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Closes: #6203 (closed)