radeonsi: Refuse to accept code with unhandled relocations

They might lead to unrecoverable GPU hang.
Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Cc: mesa-stable@lists.freedesktop.org
(cherry picked from commit 9baacf3f)