RFR: 8366457: Add ResourceArea and Arena allocators for the RBTree [v2]

[Afshin Zafari]

On Thu, 12 Feb 2026 14:48:14 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> This PR adds Arena and ResourceArea allocators to the RBTree. The test checks that we can make RBTrees from these allocators and that a basic upsert works.
>
> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update copyrights

Thank you for this enhancement. LGTM.

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Marked as reviewed by azafari (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29082#pullrequestreview-3812416344