RFR: 8370846: Support execution of mlvm testing with test thread factory [v2]

[Chris Plummer]

On Tue, 28 Oct 2025 22:35:34 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

>> The MainWrapper used test thread factory has generated lambda method. So the AbsentInformationException is expected.  The actual source path is not checked.
>> 
>> Tested by run mlvm tests with and without test thread factory.
>> 
>> Also
>> jdk/test/lib/thread/TestThreadFactory.java
>> updated to provide TestThreadFactory. isTestThreadFactorySet() 
>> that could be used by tests instead of checking property "test.thread.factory" directly.
>
> Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   improved comment

Looks good.

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Marked as reviewed by cjplummer (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28028#pullrequestreview-3546371263