aco: fix hash statistic
Signed-off-by:Rhys Perry <pendingchaos02@gmail.com> Reviewed-by:
Samuel Pitoiset <samuel.pitoiset@gmail.com> Fixes: 897561b7 ("aco: add aco_postprocess_shader() helper") Part-of: <mesa/mesa!17954> (cherry picked from commit bd40e1b0)