RFR: 8355536: Create version constants to model preview language and vm features [v2]

[Chen Liang]

On Sun, 4 May 2025 20:33:36 GMT, Luca Kellermann <duke at openjdk.org> wrote:

>> Don't know why you recommend this, but this aims to explain why this API is reflective preview API instead of an essential preview API (that does not have `reflective = true`). Particular tools wish to perform this specific check, like `javap`; otherwise, I would have marked this as non-reflective, and tools must resort to a third-party knowledge pool to parse preview features related to the current release.
>
> It sounded wrong, maybe "to allow" (without 's') would be better.

Suggestion:

     * This is a reflective preview API to allow tools running in Java runtime

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PR Review Comment: https://git.openjdk.org/jdk/pull/25017#discussion_r2072719721