RFR: 8037914: Add JFR event for string deduplication [v8]

[duke]

On Mon, 17 Nov 2025 14:45:29 GMT, Francesco Andreuzzi <fandreuzzi at openjdk.org> wrote:

>> In this PR I introduce a new JFR event: `jdk.StringDeduplication`
>> 
>> The new event is emitted every time a deduplication cycle happens.
>> 
>> Passes tier1 and tier2 (fastdebug).
>
> Francesco Andreuzzi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix year

@fandreuz 
Your change (at version 40829ead2e80bab673d4852914eabfdee72dc7ce) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/28015#issuecomment-3546402253