turnip: disable LRZ depending on fragment changes

Disable LRZ write if the fragment shader discard the fragments, modify
its position or if early-Z is disabled.

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5146>
1 file changed