Combo cannot handle Tuple nodes.

ir/opt/combo.c

@@ -3268,6 +3268,7 @@ void combo(ir_graph *irg)
 {
 	assure_irg_properties(irg,
 		IR_GRAPH_PROPERTY_NO_BADS
+		| IR_GRAPH_PROPERTY_NO_TUPLES
 		| IR_GRAPH_PROPERTY_CONSISTENT_OUTS
 		| IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO);