RFR: 8241001: Improve logging in the ConcurrentGCBreakpoint mechanism

[Kim Barrett]

> On Mar 19, 2020, at 3:53 AM, Per Liden <per.liden at oracle.com> wrote:
> 
> On 3/19/20 5:41 AM, Kim Barrett wrote:
>> Please review this change to the logging output produced by the
>> ConcurrentGCBreakpoint facility.
>> […]CR:
>> https://bugs.openjdk.java.net/browse/JDK-8241001
>> Webrev:
>> https://cr.openjdk.java.net/~kbarrett/8241001/open.00/
> 
> Looks good!

Thanks.