RFR: 8339699: Optimize DataOutputStream writeUTF [v6]

[Chen Liang]

On Fri, 20 Sep 2024 05:09:19 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> PR #20772 introduced an optimization for writeUTF, which can also be used in DataOutputStream::writeUTF.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   bug fix for write long utf

Tier 1-3 tests look good

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20886#pullrequestreview-2318757166