Withdrawn: 7902831: Provide way to isolate tests from general concurrency

[duke]

On Thu, 18 Feb 2021 20:13:20 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

> a prototype solution of [CODETOOLS-7902831](https://bugs.openjdk.java.net/browse/CODETOOLS-7902831) which changes `exclusiveAccess` tests to behave like "nonconcurrent" tests, i.e. to be isolated from concurrent execution with any other tests. the prototype uses a read-write lock to achive that.

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/jtreg/pull/4