radeonsi/gfx9: workaround for INTERP with indirect indexing

and clean up the conditions.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Cc: 18.0 18.1 <mesa-stable@lists.freedesktop.org>
(cherry picked from commit 6d19120da851c0d3f97376c733d674f7c8ab0457)
1 file changed