The documentation says that if we don't use force_delta, the LOD will be
-infinity for non-active lanes before bias and clamp are applied. This
is not what we want, so let's instead assume all threads are active, and
let helper-invocations do their job to compute correct values.
While this is only needed for the second iteration, let's just leave it
on for both for simplicity.
Fixes: e317136536 ("pan/va: Add support for nir_texop_lod")
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33069>
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