bc6b527b52
We need to use nir_is_helper_invocation instead of
nir_load_helper_invocation, to correctly predicate stores after demote.
Identified in a Piglit on AGX a year ago but I forgot to upstream this.
Fixes: 586da7b329 ("nir: Add nir_lower_helper_writes pass")
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33939>