anv: flush pipeline before query result copies

Pipeline state pending bits should be taken into account when copying
results.

In the particular bug below, the results of the
vkCmdCopyQueryPoolResults() command was being overwritten by the
preceding vkCmdCopyBuffer() with a same destination buffer. This is
because we copy the buffers using the 3D pipeline whereas we copy the
query results using the command streamer. Those pieces of HW work in
parallel and the results are somewhat undefined.

v2: Unconditionally flush the pipeline before copying the results
    (Jason)

v3: Wrap & expressions (Jason)

Signed-off-by: Lionel Landwerlin <[email protected]>
Suggested-by: Jason Ekstrand <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108894
Cc: [email protected]

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