ac/nir/ngg: Don't call has_input_primitive in GS lowering.

The entire GS lowering will be moved to another file, which
won't have this function.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33218>

src/amd/common/nir/ac_nir_lower_ngg.c

@@ -2859,7 +2859,7 @@ ac_nir_lower_ngg_gs(nir_shader *shader, const ac_nir_lower_ngg_options *options)
    state.lds_addr_gs_scratch = nir_load_lds_ngg_scratch_base_amd(b);
 
    /* Wrap the GS control flow. */
-   nir_if *if_gs_thread = nir_push_if(b, has_input_primitive(b));
+   nir_if *if_gs_thread = nir_push_if(b, nir_is_subgroup_invocation_lt_amd(b, nir_load_merged_wave_info_amd(b), .base = 8));
 
    nir_cf_reinsert(&extracted, b->cursor);
    b->cursor = nir_after_cf_list(&if_gs_thread->then_list);