RFR: 8247281: migrate ObjectMonitor::_object to OopStorage [v5]

[Erik Österlund]

On Wed, 16 Sep 2020 00:21:02 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

>> Daniel D. Daugherty has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   rkennke, coleenp, fisk CR - delete random assert() that knows too much about markWords.
>
> Marked as reviewed by sspitsyn (Reviewer).

I added a release note (https://bugs.openjdk.java.net/browse/JDK-8253225) describing that these roots are now weak, and
hence won't be reported. Please have a look at that, to make sure what I am describing makes sense.

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PR: https://git.openjdk.java.net/jdk/pull/135