RFR: 8240722: [BACKOUT] G1DirtyCardQueue destructor has useless flush

[Kim Barrett]

> On Mar 9, 2020, at 3:59 AM, Stefan Johansson <stefan.johansson at oracle.com> wrote:
> 
> Looks good,
> StefanJ

Thanks.

> On 2020-03-09 08:38, Kim Barrett wrote:
>> Please review this backout of JDK-8240133, which turns out to have
>> problems and needs a bit of a rethink; see JDK-8240722 for details.
>> CR:
>> [backout] https://bugs.openjdk.java.net/browse/JDK-8240722
>> [original] https://bugs.openjdk.java.net/browse/JDK-8240133
>> Webrev:
>> https://cr.openjdk.java.net/~kbarrett/8240722/open.00/
>> Testing:
>> Local build.