8331142: Add test for number of loader threads in BasicDirectoryModel

[luchenlin]

I backport this for parity with 11.0.25-oracle. The test is limit to Windows, so backport with JDK-8331495 together, also backport with the new issue JDK-8331999

threads.addAll(Stream.generate(() -> new Thread(new Scanner(fc))) .limit(NUMBER_OF_THREADS) .toList()); change to as not supported in 11.

threads.addAll(Stream.generate(() -> new Thread(new Scanner(fc))) .limit(NUMBER_OF_THREADS) .collect(Collectors.toList()));

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Progress

• [ ] Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• [ ] JDK-8331495 needs maintainer approval
• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue
• [ ] JDK-8331142 needs maintainer approval

Issues

• JDK-8331142: Add test for number of loader threads in BasicDirectoryModel (Bug - P4)
• JDK-8331495: Limit BasicDirectoryModel/LoaderThreadCount.java to Windows only (Sub-task - P3)

Reviewing

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