RFR: 8359707: Add classfile modification code to RedefineClassHelper [v6]

[Serguei Spitsyn]

On Wed, 25 Jun 2025 21:00:15 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:
> 
>   Made it even shorter.

Marked as reviewed by sspitsyn (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/25857#pullrequestreview-2960551515