We can't use shader->info.stage here because it is only initialized in
pan_shader_compile, which is called after nir_lower_descriptors. This
causes us to miss the index adjustment to make room for the varying
attributes when LD_VAR_BUF is disabled.
Signed-off-by: Olivia Lee <olivia.lee@collabora.com>
Fixes: 7b949dd8c4 ("panvk: Use LD_VAR_BUF[_IMM] when possible")
Reviewed-by: Christoph Pillmayer <christoph.pillmayer@arm.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37471>
729827878a