[jdk25u] RFR: 8357822: C2: Multiple string optimization tests are no longer testing string concatenation optimizations [v2]

[duke]

On Wed, 6 Aug 2025 16:36:58 GMT, Francesco Andreuzzi <duke at openjdk.org> wrote:

>> Clean backport, adds several tests for string concatenation optimization in C2.
>
> Francesco Andreuzzi has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
> 
>   Backport 6c616c71ec9a8ee6e0203921deef20d09db39698

@fandreuz 
Your change (at version 92ea04d3b9a435654265db898d229bde93d43b7b) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk25u/pull/73#issuecomment-3213427855