anv: rework queries writes to ensure ordering memory writes

We use a mix of MI & PIPE_CONTROL commands to write our queries' data
(results & availability). Those commands' memory write order is not
guaranteed with regard to their order in the command stream, unless CS
stalls are inserted between them. This is problematic for 2 reasons :

   1. We copy results from the device using MI commands even though
      the values are generated from PIPE_CONTROL, meaning we could
      copy unlanded values into the results and then copy the
      availability that is inconsistent with the values.

   2. We allow the user to poll on the availability values of the
      query pool from the CPU. If the availability lands in memory
      before the values then we could return invalid values.

This change does 2 things to address this problem :

      - We use either PIPE_CONTROL or MI commands to write both
        queries values and availability, so that the ordering of the
        memory writes guarantees that if availability is visible,
        results are also visible.

      - For the occlusion & timestamp queries we apply a CS stall
        before copying the results on the device, to ensure copying
        with MI commands see the correct values of previous
        PIPE_CONTROL writes of availability (required by the Vulkan
        spec).

Signed-off-by: Lionel Landwerlin <[email protected]>
Reported-by: Iago Toral Quiroga <[email protected]>
Cc: [email protected]
Reviewed-by: Jason Ekstrand <[email protected]>

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