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

[Xueming Shen]

On Fri, 7 Nov 2025 22:11:30 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
>
> src/java.base/share/classes/jdk/internal/lang/CaseFolding.java.template line 152:
> 
>> 150:                 }
>> 151:             }
>> 152:         }
> 
> If expanded_case_cps was sorted, Array.binarySearch could be used to find the index of the first character in the range.
> And the loop could break when cp reaches the end of the range.

This is the existing implementation. I will leave it to the next round when we are back to the regex.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27628#discussion_r2516389642