RFR: 8212107: VMThread issues and cleanup [v4]

[Daniel D.Daugherty]

On Wed, 23 Sep 2020 15:26:51 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update after Shipilev
>
> Looks good!

I'm looking at vmThread.cpp via the webrev and the "next" button
on the frames view has stopped working after change number 8:

https://openjdk.github.io/cr/?repo=jdk&pr=228&range=05#frames-6

The "Scroll Down" button is working so I'll push thru it...

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PR: https://git.openjdk.java.net/jdk/pull/228