RFR: 8074101: Add verification that all tasks are actually claimed during roots processing [v3]

Wed Jan 13 10:20:12 UTC 2021

On Wed, 13 Jan 2021 08:38:25 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Albert Mingkun Yang has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.
>
> Changes requested by kbarrett (Reviewer).

Addressed all suggestions in the revision.

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