RFR: 8074101: Add verification that all tasks are actually claimed during roots processing [v5]

[Albert Mingkun Yang]

On Fri, 15 Jan 2021 14:39:06 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   review
>
> Lgmt.

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/2046