RFR: 8187042: Events to show which objects are associated with biased object revocations

[Robin Westberg]

Hi all,

Please review this change to add event-based tracing events for biased lock 
revocations:

Issue: https://bugs.openjdk.java.net/browse/JDK-8187042 
<https://bugs.openjdk.java.net/browse/JDK-8187042>
Webrev (courtesy of Erik Gahlin): http://cr.openjdk.java.net/~egahlin/8187042/ 
<http://cr.openjdk.java.net/~egahlin/8187042/>

Best regards,
Robin