[code-reflection] RFR: Debug appropriate code element toString

[Maurizio Cimadamore]

On Wed, 28 May 2025 15:50:19 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> The `toString` of code elements (op, body, block) can be a little less verbose and better for debugging, especially so for blocks where we can include the index.

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/babylon/pull/436#pullrequestreview-2875657398