RFR: 8331051: Add an `@since` checker test for `java.base` module

[Jonathan Gibbons]

On Mon, 29 Apr 2024 11:31:23 GMT, Nizar Benalla <duke at openjdk.org> wrote:

>> test/jdk/tools/sincechecker/SinceChecker.java line 423:
>> 
>>> 421:     }
>>> 422: 
>>> 423:     //these were preview in before the introduction of the @PreviewFeature
>> 
>> Just curious: where do you find this information?
>
> Used a script to get all the elements with `@Deprecated(forRemoval=true, since=...)`, `@jdk.internal.preview`, `{@preview Associated with ....` in their javadoc.
> And then had to cross reference with a document that had all the ids

Thanks for the update

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PR Review Comment: https://git.openjdk.org/jdk/pull/18934#discussion_r1586827124