pan/bi: Fix assert when writing vertex outputs

Varying stores require us to generate a LEA_ATTR_IMM instruction, which
is a load.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Fixes: 0aa08ae2f67 ("nir: Split NIR_INTRINSIC_TYPE into separate src/dest indices")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6985>
1 file changed