[code-reflection] RFR: Build ref attributes from externalized type elems

[Maurizio Cimadamore]

On Fri, 2 May 2025 17:27:46 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> This removes the dependence on specific parsing of refs. Now they are type elements we can use its string form.

Looks good!

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Marked as reviewed by mcimadamore (Reviewer).

PR Review: https://git.openjdk.org/babylon/pull/418#pullrequestreview-2812566257