radeonsi: Collapse SSA check

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24432>

src/gallium/drivers/radeonsi/si_shader_nir.c

@@ -15,8 +15,7 @@ bool si_alu_to_scalar_packed_math_filter(const nir_instr *instr, const void *dat
    if (instr->type == nir_instr_type_alu) {
       nir_alu_instr *alu = nir_instr_as_alu(instr);
 
-      if (alu->dest.dest.is_ssa &&
-          alu->dest.dest.ssa.bit_size == 16 &&
+      if (alu->dest.dest.ssa.bit_size == 16 &&
           alu->dest.dest.ssa.num_components == 2)
          return false;
    }