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

[Coleen Phillimore]

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.

Thanks for the reviews Leonid, Serguei and David, and thanks for the help with ClassFile API Chen.

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PR Comment: https://git.openjdk.org/jdk/pull/25857#issuecomment-3024888621