RFR: 8377035: [s390x] Disable JSR166 test cases which uses virtual threads [v4]

[Alan Bateman]

On Fri, 13 Feb 2026 05:23:18 GMT, Harshit470250 <duke at openjdk.org> wrote:

>> ReentrantReadWriteLock20Test.java is failing on s390 due to virtual threads which are not yet implemented on s390. 
>> SynchronousQueue20Test.java also uses virtual thread so I am also disabling it.
>
> Harshit470250 has updated the pull request incrementally with one additional commit since the last revision:
> 
>   change java20TestClassNames only if on s390

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29555#pullrequestreview-3795406872