[code-reflection] RFR: Remove ExternalizableOp

[Paul Sandoz]

On Thu, 26 Jun 2025 11:16:24 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> Now that externalization is a more "official" part of ops and type elements, I wonder if having a separate `extern` package still makes sense.

Thanks for the review. For now at least i think it does. We have two audiences for ops, those who develop them and those who use them. The largest audience by far will consist of those who use ops, and I think it rare they will interact directly externalization functionality.

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PR Comment: https://git.openjdk.org/babylon/pull/464#issuecomment-3008900557