RFR (M) 8235573: Move JFR ObjectSample oop into OopStorage

[coleen.phillimore at oracle.com]

Markus contributed a better incremental patch on top of this, please 
review tested 02 patch instead.

open webrev at http://cr.openjdk.java.net/~coleenp/2020/8235573.02/webrev

Thanks,
Coleen

On 7/31/20 10:16 AM, coleen.phillimore at oracle.com wrote:
> Summary: Add a weak OopStorage for JFR and move the oops there. Remove 
> GC code to process oops.
>
> Tested with tier1,5, and 6.  Built with shenandoah.
>
> open webrev at http://cr.openjdk.java.net/~coleenp/2020/8235573.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8235573
>
> Thanks,
> Coleen