[crac] RFR: Synchronize concurrent clean() in PhantomCleanableRef

[Radim Vansa]

On Fri, 12 May 2023 13:50:34 GMT, Radim Vansa <duke at openjdk.org> wrote:

> Fixes failures in RefQueueTest and JarFileFactoryCacheTest.

It seems that the general approach in #73 would be favored, though it's a more complicated one. Feel free to reopen.

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PR Comment: https://git.openjdk.org/crac/pull/70#issuecomment-1576852060