anv/query: flush render target before copying results

anv/query: flush render target before copying results

This change tracks render target writes in the pipeline and applies a
render target flush before copying the query results to make sure the
preceding operations have landed in memory before the command streamer
initiates the copy.

v2: Simplify logic in CopyQueryResults (Jason)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108909
Fixes: 37f9788e9a8e44 ("anv: flush pipeline before query result copies")
Cc: mesa-stable@lists.freedesktop.org