RFR: 8349525: RBTree: provide leftmost, rightmost, and a simple way to print trees [v3]

[Johan Sjölen]

On Fri, 7 Feb 2025 15:47:49 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> For things I currently work on (compilation memory statistic), I need this functionality.
>> 
>> Changes:
>> 
>> - added leftmost() and rightmost() (pretty self-explanatory)
>> - added print_on(outputStream*) (likewise)
>> - const correctness
>> - other minor cleanups
>> - gtests for all added functions
>> 
>> Tests: GHA (all clean), manual tests on Linux x64
>
> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
> 
>   feedback caspar

LGTM

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Marked as reviewed by jsjolen (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23486#pullrequestreview-2602941153