RFR: 7902989: jcstress: Add samples for high-level race conditions [v10]

[Aleksey Shipilev]

On Fri, 2 Jul 2021 16:40:14 GMT, Michael Mirwaldt <github.com+6693355+mmirwaldt at openjdk.org> wrote:

>> I have created two more samples:
>> 
>> - one sample for read-modify-write-sequences
>> - one sample for check-then-react-sequences
>
> Michael Mirwaldt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   added missing word "completed" to one description of an outcome

Marked as reviewed by shade (Committer).

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PR: https://git.openjdk.java.net/jcstress/pull/88