RFR: 7902989: jcstress: Add samples for high-level race conditions [v7]

[Michael Mirwaldt]

On Thu, 1 Jul 2021 16:01:36 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:
> 
>   improved the code so that the used var names in the descriptions of the outcomes are not ambiguous any more now

I close this and reopen it with mmirwaldt

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