RFR: 8368050: Validation missing in ClassFile signature factories [v5]

[Adam Sotona]

On Fri, 19 Sep 2025 22:14:34 GMT, Chen Liang <liach at openjdk.org> wrote:

>> The Signature modeling in the ClassFile API is missing some validations required by JVMS, notably identifier character restrictions and void type restrictions. In addition, the model currently uses `ClassDesc` to indicate a simple name for an inner class signature, which is incorrect, and this patch proposes to deprecate that API for removal.
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   More fixes

Looks good to me.

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Marked as reviewed by asotona (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27380#pullrequestreview-3252528078