r600g: Add more (un)likely functions

1-st is obvious because of assert, 2-nd stolen frmo si_draw_vbo(),
and 3-rd is just a small refactoring.

Signed-off-by: Constantine Kharlamov <Hi-Angel@yandex.ru>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>
1 file changed