t/oo/metamodel.t: implement todo-ed item: new opcode makes working objects

[jkeenan]

Creating a ticket to track this todo-ed item:

t/oo/metamodel.t-87-
t/oo/metamodel.t:88:    todo(0, "new opcode makes working objects", "not implemented")
t/oo/metamodel.t-89-#    $P0 = new "Dog"

[bacek]

Hello.

I uncommented actual todo code in test in r46465 and it's passed. Closing ticket.

-- Bacek