RFR: 8339260: Move rarely used constants out of ClassFile [v9]

[Luca Kellermann]

On Mon, 7 Oct 2024 17:07:47 GMT, Chen Liang <liach at openjdk.org> wrote:

> Your example is an exact antipattern from our data-oriented model: we would want users to check the object type with `instanceof` (should be `is` in kotlin) instead of checking these constants.

I'm aware, this was just the first example I could come up with.

> Yet I think we can consider promoting Constant Pool tag from byte or char, short, or int to represent a u1 in case it goes over 127.

Maybe just using `int` everywhere for consistency might be a good option too.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20773#discussion_r1790628903