Request for Review (xs) - 8150302: Reference processing logging prints the "from list" incorrectly

[Jon Masamitsu]

The logging for Reference processing prints the first item (head) of
the list and should print the address of the list.

https://bugs.openjdk.java.net/browse/JDK-8150302

http://cr.openjdk.java.net/~jmasa/8150302/webrev.00/

Thanks.

Jon