Load-store optimization cannot cope with Tuple nodes.

This fixes opt/loadstore5.c.

ir/opt/ldstopt.c

@@ -2154,6 +2154,7 @@ void optimize_load_store(ir_graph *irg)
 		IR_GRAPH_PROPERTY_NO_UNREACHABLE_CODE
 		| IR_GRAPH_PROPERTY_CONSISTENT_OUT_EDGES
 		| IR_GRAPH_PROPERTY_NO_CRITICAL_EDGES
+		| IR_GRAPH_PROPERTY_NO_TUPLES
 		| IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE
 		| IR_GRAPH_PROPERTY_CONSISTENT_ENTITY_USAGE);