r600/sfn: remove obsolete index and address register handling

This old code was needed to get the backend assembler to do the
right thing when emitting index and address registers, but sfn
is handling this now so we can drop this.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36101>
1 file changed