RFR: 8310644: Make panama memory segment close use async handshakes [v3]

[Erik Österlund]

On Thu, 23 Nov 2023 16:32:28 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Erik Österlund has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Comments from Jorn
>
> LGTM

Thanks for the reviews @JornVernee @pchilano and @mcimadamore!

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PR Comment: https://git.openjdk.org/jdk/pull/16792#issuecomment-1831817744