[jdk24] RFR: 8347646: module-info classfile missing the preview flag

[Adam Sotona]

On Tue, 14 Jan 2025 12:07:16 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [bb93f67e](https://github.com/openjdk/jdk/commit/bb93f67ea8955216e81d1aef58d0ec8bf1fc9bb1) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Jan Lahoda on 14 Jan 2025 and was reviewed by Adam Sotona.
> 
> Thanks!
> 
> Original description:
> 
> Consider module-info.java like this:
> 
> module m {
>     requires transitive java.base;
> }
> 
> 
> When compiled with `--enable-preview --source 24/25`, the resulting classfile is missing the preview flag.
> 
> This PR proposes to use `Preview.checkSourceLevel` to check the source level, which marks the source to use the preview feature.

Marked as reviewed by asotona (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23101#pullrequestreview-2549600201