The TES workaround code is still going to be needed even after
we rework URB output handling for VS/TES/GS to use NIR intrinsics.
For VS, we know at least one URB write will have been emitted at
the end of the program, so we can just tag it.
GS already handles EOT via emit_gs_thread_end().
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39666>
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