RFR: 8292591: Experimentally add back barrier-less Java thread transitions [v5]

[Robbin Ehn]

On Fri, 9 Sep 2022 10:44:47 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixed ws
>
> This looks good to me. I looked through the code to see if I can find any additional thread state filtering that would now require the system memory barrier to work reliably, but could not find any. So it would seem that you found them all.

@fisk, great, thank you!

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PR: https://git.openjdk.org/jdk/pull/10123