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

[Kim Barrett]

On Fri, 30 Jul 2021 19:19:49 GMT, Daniel D. Daugherty <dcubed 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.

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Marked as reviewed by kbarrett (Reviewer).

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