Review request for JMC-6480: Fixing the GC Locker rule.

[Marcus Hirt]

Hi all,

Please review this fix for the GC Locker rule.

Jira:   https://bugs.openjdk.java.net/browse/JMC-6480
Webrev: http://cr.openjdk.java.net/~hirt/JMC-6480/webrev.0/

Kind regards,
Marcus