RFR: 7088: Show concurrent option showing lesser number of records. [v2]

[Marcus Hirt]

On Wed, 3 Feb 2021 18:47:58 GMT, Henrik Dafgård <hdafgard at openjdk.org> wrote:

>> Due to how StreamBackedItemCollections differ from EventCollections we can't rely on the assumption made that disjoint events are sorted in each IItemIterable. And since the classes aren't visible from RulesToolkit we have to look at the class name like this.
>
> Henrik Dafgård has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add comment with issue reference

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/208