RFR: 8359707: Add classfile modification code to RedefineClassHelper [v7]

[Coleen Phillimore]

On Thu, 26 Jun 2025 11:58:11 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 two additional commits since the last revision:
> 
>  - Update test/lib/RedefineClassHelper.java
>    
>    Co-authored-by: David Holmes <62092539+dholmes-ora at users.noreply.github.com>
>  - Fix imports

Also added back the byte[] version of the method that I inadvertently deleted.

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PR Comment: https://git.openjdk.org/jdk/pull/25857#issuecomment-3012689944