It's possible that undef is written to clip/cull distance outputs and
they're eliminated, and we never set any position export to done=1 because
outinfo->pos_exports was calculated with the expectation that clip/cull is
exported.
Eliminating the export and fixing the done=1 bit hangs because the
hardware is still expecting clip/cull distances.
Fixes dEQP-VK.rasterization.provoking_vertex.transform_feedback.first.line_list
hang with LLVM.
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19200>
974358a8c1