RFR: 8359707: Add classfile modification code to RedefineClassHelper [v2]

[Coleen Phillimore]

On Wed, 25 Jun 2025 05:30:18 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

>> `jdk.internal.classfile.components` has a `ClassRemapper` that may serve this purpose. It updates all internal names and occurrences in descriptors.
>
> BTW, I've also noticed this issue with returning 0 but forgot to post my question. This suggestion from Alex looks good to me, at least, if the `ClassRemapper` is tricky to borrow.

ClassRemapper is a nice way to do this but it requires all the tests and the test jar build to use @modules to access it, so I chose a different way with the ClassFile API.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25857#discussion_r2167581218