Make List:D.iterator a multi
Make List:D.iterator a multi

So that List.iterator will produce an iterator producing List, rather
than die-ing.

salortiz/rakudo,rakudo/rakudo,salortiz/rakudo,tbrowder/rakudo,salortiz/rakudo,rakudo/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,rakudo/rakudo,rakudo/rakudo,tbrowder/rakudo,salortiz/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,rakudo/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,salortiz/rakudo,MasterDuke17/rakudo,salortiz/rakudo,MasterDuke17/rakudo,rakudo/rakudo,tbrowder/rakudo