RFR: 8366328: G1: Crash on reading os::thread_cpu_time

[Martin Doerr]

On Thu, 4 Sep 2025 07:48:11 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

> Hi,
> 
> Please review this patch to ensure that we do not attempt to read CPU time for GC threads that have already been terminated.
> 
> Testing: Tier 1-3.

This PR needs an update since `Atomic` has been renamed to `AtomicAccess`.

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PR Comment: https://git.openjdk.org/jdk/pull/27087#issuecomment-3286762853