RFR: 8249004: Reduce ThreadsListHandle overhead in relation to direct handshakes

[Daniel D.Daugherty]

On Sun, 4 Jul 2021 23:39:00 GMT, David Holmes <dholmes 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.
>
> Hi Dan,
> 
> I just updated the bug report. This really isn't addressing the reasons the RFE was filed.
> 
> David

@dholmes-ora and @sspitsyn - I still need a re-review from you guys.

@robehn - A re-review from you would be good, but I think I cleanly
addressed your last comments...

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