vrend: move last used shader program in front of the list

With that shaders that are used more frequently will remain at the
top of the list, and since the search in the shader program list is
linear, this should save some time.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
1 file changed