Add @Stable to java.lang.CharacterDataLatin1 and other CharacterData classes

[Chen Liang]

On second thought, we should just focus on adding stable and final as you recommend - we should fix stylistic things with no semantic impact later.
________________________________
From: core-libs-dev <core-libs-dev-retn at openjdk.org> on behalf of Chen Liang <chen.l.liang at oracle.com>
Sent: Saturday, May 24, 2025 6:16 PM
To: core-libs-dev <core-libs-dev at openjdk.org>; wenshao <shaojin.wensj at alibaba-inc.com>
Subject: Re: Add @Stable to java.lang.CharacterDataLatin1 and other CharacterData classes

Hello Shaojin,
I think your proposal is reasonable. These arrays are never mutated. Meanwhile I see some declarations like int A[] in CharacterData00, would be nice if you can convert those declarations to like int[] A too.

Regards,
Chen
________________________________
From: core-libs-dev <core-libs-dev-retn at openjdk.org> on behalf of wenshao <shaojin.wensj at alibaba-inc.com>
Sent: Saturday, May 24, 2025 12:55 PM
To: core-libs-dev <core-libs-dev at openjdk.org>
Subject: Add @Stable to java.lang.CharacterDataLatin1 and other CharacterData classes

Classes such as java.lang.CharacterDataXXX have multiple static final arrays, which will not be modified. We should add @Stable to provide information to the optimizer.

such as

```java
class CharacterData00 {
    @Stable static final char[] X =
    @Stable static final char[] Y =
    @Stable static final int[] A =
    @Stable static final char[] B =
}
```

-
Shaojin Wen
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