RFR: 8287384: Speed up jdk.test.lib.util.ForceGC

[Mandy Chung]

On Thu, 26 May 2022 21:40:42 GMT, Xue-Lei Andrew Fan <xuelei at openjdk.org> wrote:

> Even using a Cleaner is a more overhead than necessary.
> I would have skipped the overhead of a cleaner and Atomic classes with something more self contained as a static method:

Hmm... one benefit of Cleaner is the ease of use to avoid the need of managing the reference queue.  If the performance of the Cleaner API is a concern, perhaps we should look into reducing its overhead?

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PR: https://git.openjdk.java.net/jdk/pull/8907