RFR(S): 8189368: Add information on current bias holder for BiasedLockRevocation event

[Robin Westberg]

Hi all,

Please review the following changes which add a new field to the BiasedLockRevocation event, previousOwner, containing information on which thread (if any) owned the bias before it was revoked.

Issue:
https://bugs.openjdk.java.net/browse/JDK-8189368

Webrev:
http://cr.openjdk.java.net/~egahlin/8189368_1/

Best regards,
Robin