RFR: 8332256: Shenandoah: Do not visit heap threads during shutdown

[Aleksey Shipilev]

On Tue, 14 May 2024 21:29:01 GMT, William Kemper <wkemper at openjdk.org> wrote:

> In rare cases, this may lead to a crash or hang during shutdown.

This makes sense. 

Do we have any sample how a crash would look like? Would be nice to attach it to the bug.

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19239#pullrequestreview-2057315210