RFR: 8352565: Add native method implementation of Reference.get() [v4]

[Kim Barrett]

On Fri, 11 Apr 2025 08:14:29 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> test/hotspot/jtreg/gc/TestNativeReferenceGet.java line 137:
>> 
>>> 135:             }
>>> 136:             checkQueue();       // One last check after refproc complete.
>>> 137:         } catch (InterruptedException e) {
>> 
>> Rather than using Reference.remove with a timeout, I've changed this to use waitForReferenceProcessing.
>> That removes false passes (from reference processing being slow to deliver) and also removes the delay
>> until timeout for the passing case.
>
> https://github.com/openjdk/jdk/pull/24527 is proposing a different way to access
> `waitForReferenceProcessing`.  I'll wait for that.

Test has now been changed to use the new `WhiteBox::waitForReferenceProcessing()`.
So how about some reviews...

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PR Review Comment: https://git.openjdk.org/jdk/pull/24315#discussion_r2082106208