RFR: 8347124: Clean tests with --enable-linkable-runtime [v2]

[David Holmes]

On Wed, 8 Jan 2025 14:56:55 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

>> Please review this trivial test-only patch in support of running tests on JEP 493 enabled builds. Both tests use the `ToolProvider` API so as to run `jlink` in-process of the test JVM which includes module patches (as in - uses `--patch-module`) which is not supported for JEP 493 enabled JDKs. The proposed fix is to run those two tests in `/othervm` so as to no longer see the module patch of the test JDK.
>> 
>> Testing:
>> - [ ] GHA
>> - [x] Affected tests which fail prior the patch and pass after with a JEP 493 enabled JDK. Also tested on a JDK that includes `jmods` folder.
>> 
>> Thoughts?
>
> Severin Gehwolf has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Copyright and @comment

Pardon my ignorance, but in neither of these tests is it evident to me that "patched modules" are being used. Where does that arise?

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PR Review: https://git.openjdk.org/jdk/pull/22969#pullrequestreview-2538683215