zink: fix synchronization when drawing from streamout
this was well-documented, but ultimately wrong: the synchronization being used was for binding streamout buffers (not counter buffers) as vertex buffers, which was already handled just fine in the normal vertex buffer binding drawing from streamout ONLY uses the counter buffer, which means the counter buffer needs to be synchronized for reading cc: mesa-stable fixes (nv): KHR-GL46.transform_feedback.draw_xfb_feedbackk_test KHR-GL46.transform_feedback.draw_xfb_instanced_test KHR-GL46.transform_feedback.draw_xfb_stream_instanced_test Reviewed-by:Dave Airlie <airlied@redhat.com> Part-of: <mesa/mesa!16065> (cherry picked from commit a056cbc6) Conflicts: src/gallium/drivers/zink/ci/zink-nv-fails.txt
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