sparc: fix lower_dw/lower_switch order

This should fix testsuite/opt/switch_ll.c

ir/be/sparc/bearch_sparc.c

@@ -447,12 +447,16 @@ static void sparc_lower_for_target(void)
 
 	lower_builtins(0, NULL);
 
+	for (size_t i = 0; i < n_irgs; ++i) {
+		ir_graph *irg = get_irp_irg(i);
+		lower_switch(irg, 4, 256, mode_gp);
+	}
+
 	sparc_lower_64bit();
 
 	for (i = 0; i < n_irgs; ++i) {
 		ir_graph *irg = get_irp_irg(i);
 		ir_lower_mode_b(irg, mode_Iu);
-		lower_switch(irg, 4, 256, mode_gp);
 		/* TODO: Pass SPARC_MIN_STACKSIZE as addr_delta as soon as
 		 * Alloc nodes are implemented more efficiently. */
 		lower_alloc(irg, SPARC_STACK_ALIGNMENT, true, 0);