RFR: 8249004: Reduce ThreadsListHandle overhead in relation to direct handshakes [v10]

[Robbin Ehn]

On Tue, 2 Nov 2021 17:26:41 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> A fix to reduce ThreadsListHandle overhead in relation to handshakes and
>> we add sanity checks for ThreadsListHandles higher in the call stack.
>> 
>> This fix was tested with Mach5 Tier[1-8]; Tier8 is still running.
>
> Daniel D. Daugherty has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8249004.cr2.patch

Marked as reviewed by rehn (Reviewer).

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