RFR: 8359707: Add classfile modification code to RedefineClassHelper [v12]

[Leonid Mesnik]

On Tue, 1 Jul 2025 01:55:48 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> I copied this code for another test in the Valhalla repo and thought it would be a good utility function.  It might be better written using the Classfile API.
>> Tested with test.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove comment.

Marked as reviewed by lmesnik (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/25857#pullrequestreview-2976286692