[11u] RFR: JDK-8273026 backport: Slow LoginContext.login() on multi threading application

[Ilarion Nakonechnyy]

Dear 11u maintainers, could you please consider a backport of the fix JDK-8273026 into OpenJDK11. The fix significantly increases the performance of LoginContext on multithreading execution. The fix was already backported into OpenJDK17 and OpenJDK13.
PR is ready for review: https://github.com/openjdk/jdk11u-dev/pull/572

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Ilarion Nakonechnyy
Software Engineer
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