RFR: 8362530: VM crash with -XX:+PrintTieredEvents when collecting AOT profiling [v3]

[Christian Hagedorn]

On Wed, 13 Aug 2025 16:48:29 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

>> When printing tiered events we take the ttyLock and also now the trainingDataLock. While benign it's best to decouple these. The solution is to gather the output bits in a buffer and then print it.
>
> Igor Veresov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address Christian's comments

Thanks Igor for the update and adding a test, looks good!

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Marked as reviewed by chagedorn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26750#pullrequestreview-3119154405