Request for reviews (XS): 7105611: Set::print() is broken

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7105611/webrev

7105611: Set::print() is broken

Set::print() is broken after 7013538 changes when I redesigned VectorSetI 
iterator. Call to VectorSet::print() hits ShouldNotCallThis() in 
VectorSet::iterate(). Note, Set::print() is not used in VM code, it is only used 
for debugging.

Reimplemented class VSetI_ to restore Set::print().

Thanks,
Vladimir