mesa: call _mesa_update_state() before validation

mesa: call _mesa_update_state() before validation

It's called in both the no_error path and the draw validation path, so we
might as well call it before the no_error conditional.

This decreases CPU overhead a lot, which I'm unable to explain. It seems
to be random gcc behavior, which I've seen quite a lot now.

Reviewed-by: Zoltán Böszörményi <zboszor@gmail.com>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8798>