RFR: 8369041: Release memory after testing in ThreadsRunner.java [v2]

[Aleksey Shipilev]

On Mon, 6 Oct 2025 10:03:10 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Small patch of cleaning up no longer used data structures after testing is complete. 
>> 
>> Test: tier1-5
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - review
>  - Merge branch 'master' into stress-free-memory
>  - stress-free-memory

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27606#pullrequestreview-3303691641