RFR: 8247281: migrate ObjectMonitor::_object to OopStorage [v2]

[Daniel D.Daugherty]

On Mon, 14 Sep 2020 08:18:02 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Daniel D. Daugherty has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   coleenp CR - changes to resolve Coleen's comments.
>
> GC changes looks good to me.

@stefank - Thanks for the review!

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