RFR: 8142487: Cleanup sun.invoke.util.Wrapper zeroes to be both reliable and lazy

[Vladimir Ivanov]

> I think we have to add a storeFence or two to avoid publishing
> NamedFunctions whose resolvedHandle may otherwise be observed as only
> partially visible:
>
> http://cr.openjdk.java.net/~redestad/8142487/webrev.03/
Same here. No need in Unsafe.storeFence if proper constructor is used.

Best regards,
Vladimir Ivanov