RFR: 8139800: Remove OopsInGenClosure

[Kim Barrett]

> On Aug 25, 2020, at 6:15 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this patch to remove OopsInGenClosure.
> 
> https://cr.openjdk.java.net/~stefank/8139800/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8139800
> 
> The patch builds upon the cleanup patches that are current out for review: JDK-8252245, JDK-8252289, JDK-8252294.

Looks good.  Thanks for the detailed overview.