RFR: 8365675: Add String Unicode Case-Folding Support [v7]

[Xueming Shen]

On Fri, 7 Nov 2025 22:19:03 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Xueming Shen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   update to use value long for folding
>
> test/jdk/java/lang/String/UnicodeCaseFoldingTest.java line 31:
> 
>> 29:  * @compile --add-exports java.base/jdk.internal.lang=ALL-UNNAMED
>> 30:  * UnicodeCaseFoldingTest.java
>> 31:  * @run junit/othervm --add-exports java.base/jdk.internal.lang=ALL-UNNAMED
> 
> The @module directive can replace the explicit --add-exports and the explicit @compile may be unnecessary.
> 
> * @modules java.base/jdk.internal.lang:+open

updated as suggested

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PR Review Comment: https://git.openjdk.org/jdk/pull/27628#discussion_r2529280093