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

[David Holmes]

On Mon, 14 Sep 2020 02:01:58 GMT, David Holmes <dholmes 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.
>
> Overall cleanup looks good. More complicated than I had expected, but then this changes the GC races with the deflation
> code.
> Not sure about the JVM TI changes!

Please note that I made comments on the "resolved" discussion on heapDumper.cpp  and jvmtiTagMap.cpp  but they were not
mentioned in the review email and are hidden in the UI unless you explicitly click on "Show resolved".

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