In the bi_emit_load_attr call site, we can use the imm_index value even
if the function returns false. The bifrost path handles this correctly.
Fixes: 652e1c2e13 ("pan/bi: Rework indices for attributes on Valhall")
Signed-off-by: Olivia Lee <olivia.lee@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37464>