Nice try but no cigar, the models mentioned are no longer in service for the most part and even the ones mentioned did not have it but it was added after initial production
Many airliners cannot dump fuel. Many can. The requirement is clear in the link I provided earlier. The airliners that cannot dump fuel, have no need for the capability. They are capable of good performance with full fuel tanks.
The A320, as with other airliners, including Boeing airliners, is capable of landing with full fuel tanks if necessary.
http://en.wikipedia.org/wiki/Fuel_dumping