anv: Set TG size based on number of threads

Series shows improvement on
TotalWarPharaoh-trace-dx11-1440p-ultra-n=2080 title by 0.96% (not a lot
but still it's improvement, so will take that.)

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35904>
3 files changed