RFR: 8354969: Add strdup function for ResourceArea [v6]

[David Holmes]

On Tue, 20 May 2025 08:04:35 GMT, Anton Artemov <duke at openjdk.org> wrote:

>> Added a strdup() method, as requested by the bug reporter. The method is added to Arena, but also available in ResourceArea, as requested. A test for the method is provided. 
>> 
>> Testing: tiers 1-4 on multiple platforms.
>
> Anton Artemov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8354969: Addressed reviewers comment.

Ship it!

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24998#pullrequestreview-2853530534