RFR: 7903671: jcstress: Update buffer tests for JDK-8318966

[Aleksey Shipilev]

On Fri, 6 Jun 2025 15:39:50 GMT, Jiří Vaněk <jvanek at openjdk.org> wrote:

> Ack. Wdyt about keeping the java version check, and on newer jdks set it to 1 then?

Maybe, but likely not. I could see how JDK-specific test behavior would be confusing: you run _seemingly the same test_ on different JDKs, but you actually run _different_ tests? Bisecting for regressions would get extra fun.

So, I would like all JDK versions attempt to run all the tests, and gracefully fail out some of them. So older JDKs would test _both_ `alignment(1)` and `alignment(8)`. Newer JDKs only run `alignment(8)` tests.

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PR Comment: https://git.openjdk.org/jcstress/pull/159#issuecomment-2949697874