[code-reflection] RFR: Replace opField with opMethod for lambdas. [v2]

[Maurizio Cimadamore]

On Mon, 6 Jan 2025 14:47:22 GMT, Mourad Abbay <mabbay at openjdk.org> wrote:

>> We replace field holding the textual representation of an identified lambda with method that returns the representation of that lambda.
>
> Mourad Abbay has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Call ModuleLayer#findLoader once and cache the result
>  - Change JCTree#codeModel 's type to MethodSymbol

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/babylon/pull/301#pullrequestreview-2532306210