RFR: 8349525: RBTree: provide leftmost, rightmost, and a simple way to print trees [v2]

[Thomas Stuefe]

On Fri, 7 Feb 2025 09:14:49 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   feedback johan
>
> Thanks, this looks good.

@jdksjolen can you re-approve?

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PR Comment: https://git.openjdk.org/jdk/pull/23486#issuecomment-2643879381