RFR (L) 8244997: Convert the JavaThread::_threadObj oop to use OopStorage

[Zhengyu Gu]

Hi Coleen,

Shenandoah part looks good to me.

Thanks,

-Zhengyu

On 8/6/20 8:40 AM, Coleen Phillimore wrote:
> Summary: Move the oop and handle releasing it in the service thread. 
> Remove Universe::oops_do from callers.
> 
> See bug for more details and discussion.  C2 code provided by Erik 
> Osterlund and Graal changes provided by Tom Rodriguez.
> 
> Tested with tiers 1-8.
> 
> bug link https://bugs.openjdk.java.net/browse/JDK-8244997
> open webrev at http://cr.openjdk.java.net/~coleenp/2020/8244997.01/webrev
> 
> Copyrights fixed, not in this webrev.
> 
> Thanks,
> Coleen
>