RFR: 8292591: Experimentally add back barrier-less Java thread transitions [v6]

[Robbin Ehn]

On Fri, 9 Sep 2022 16:44:30 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixes for Dan
>
> test/hotspot/jtreg/runtime/handshake/HandshakeTransitionTest.java line 32:
> 
>> 30:  * @test HandshakeTransitionTest
>> 31:  * @summary This does a sanity test of the poll in the native wrapper.
>> 32:  * @requires vm.debug
> 
> Why was this deleted?
> Have you tested this with release bits?

Martin asked if we could add the diagnostics flag and make the test(s) runnable in release build.
(higher chance of a race happening in release)
So I did that, and tested it locally.

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