radv: Do non-uniform lowering before bool lowering.

Since it can introduce comparisons.

Fixes: 028ce527 "radv: Add non-uniform indexing lowering."
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
(cherry picked from commit 2301b2e0)