RFR: 8271513: support JavaThreadIteratorWithHandle replacement by new ThreadsList::Iterator

[Daniel D.Daugherty]

On Sat, 31 Jul 2021 04:40:24 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> A trivial fix to support JavaThreadIteratorWithHandle replacement by new ThreadsList::Iterator.
>> 
>> This fix was tested with Mach5 Tier[1-3].
>
> Looks good, and trivial.

@kimbarrett - Thanks for the review!

-------------

PR: https://git.openjdk.java.net/jdk/pull/4948