[code-reflection] RFR: Method code model uniquness [v4]

[Maurizio Cimadamore]

On Wed, 30 Apr 2025 01:19:55 GMT, Mourad Abbay <mabbay at openjdk.org> wrote:

>> Multiple `Method` objects that represent the same java method, have different code models. This is because every time we call `Class.getMethod` or `Class.getDeclaredMethod` we get a newly created instance. One possible solution is to attach the model to the root `Method` object.
>
> Mourad Abbay has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Avoid caching Method.codeModel on non-root instances

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/babylon/pull/415#pullrequestreview-2809361456