RFR: 8264372: Threads::destroy_vm only ever returns true

[Daniel D.Daugherty]

On Fri, 16 Apr 2021 06:12:39 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Trivial cleanup to remove the bool return from Threads::destroy_vm as it only ever returned true.
> 
> Testing: tiers 1-3
> 
> Thanks,
> David

Thumbs up!

`// Don't bother changing state any more, VM is gone.`

would be a better comment.

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Marked as reviewed by dcubed (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3535