zink: add a read barrier for indirect dispatch
using the draw stage here doesn't make much sense, but that's what the spec says, so let's git er done
fixes dEQP-GL45.functional.compute.indirect_dispatch* on radv
Cc: mesa-stable
using the draw stage here doesn't make much sense, but that's what the spec says, so let's git er done
fixes dEQP-GL45.functional.compute.indirect_dispatch* on radv
Cc: mesa-stable