nir: Add goto_if jump instruction

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2401>

src/compiler/nir/nir_divergence_analysis.c

@@ -593,6 +593,11 @@ visit_jump(nir_jump_instr *jump, struct divergence_state *state)
       return state->divergent_loop_break;
    case nir_jump_return:
       unreachable("NIR divergence analysis: Unsupported return instruction.");
+      break;
+   case nir_jump_goto:
+   case nir_jump_goto_if:
+      unreachable("NIR divergence analysis: Unsupported goto_if instruction.");
+      break;
    }
    return false;
 }