RFR: 8333377: Migrate Generic Signature parsing to ClassFile API [v4]

[Chen Liang]

On Thu, 5 Dec 2024 19:48:49 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Core reflection's generic signature parsing uses an ancient library with outdated visitor pattern on a tree model and contains unnecessary boilerplates. This is a duplication of ClassFile API's signature model. We should just move to ClassFile API, which is more throughoutly tested as well.
>> 
>> To ensure compatibility, new tests are added to ensure consistent behavior when encountering malformed signatures or signatures with missing types. The reflective objects have been preserved and the only change is that lazy expansion now happens from CF objects, to reduce compatibility risks.
>
> Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
> 
>   8333377: Migrate Generic Signature parsing to ClassFile API

Sorry for the force push - Too many commits meaning fixing merge conflicts in every single one of them was a bit complicated.

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PR Comment: https://git.openjdk.org/jdk/pull/19281#issuecomment-2523787574