i965/fs: fix exec_size when emitting DIM instruction

Otherwise, DIM instructions will be emitted with the default exec size
which could be 16 in some cases, that is not legal.

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Suggested-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
1 file changed