Speed up latin1 case folding

[Claes Redestad]

RFE filed: https://bugs.openjdk.org/browse/JDK-8302877

/Claes

17 feb. 2023 kl. 18:38 skrev Eirik Bjørsnøs <eirbjo at gmail.com<mailto:eirbjo at gmail.com>>:

Hi,

The following PR suggests we can speed up Character.toUpperCase and Character.toLowerCase for latin1 code points by applying 'the oldest ASCII trick in the book':

https://github.com/openjdk/jdk/pull/12623

Thanks,
Eirik.

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