RFR: 8249004: Reduce ThreadListHandle overhead in relation to direct handshakes [v4]

[Daniel D.Daugherty]

On Wed, 22 Sep 2021 18:21:51 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Daniel D. Daugherty has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
>> 
>>  - Merge branch 'master' into JDK-8249004
>>  - Merge branch 'master' into JDK-8249004
>>  - Merge branch 'master' into JDK-8249004
>>  - Merge branch 'master' into JDK-8249004
>>  - 8249004: Reduce ThreadListHandle overhead in relation to direct handshakes
>
> This looks good.

@coleenp - Thanks, but...

I'm redoing this fix in a different way to address @dholmes-ora comment from above:

> I just updated the bug report. This really isn't addressing the reasons the RFE was filed.

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PR: https://git.openjdk.java.net/jdk/pull/4677