[code-reflection] RFR: Enhance grammar of op attributes

[Paul Sandoz]

On Wed, 28 May 2025 15:28:30 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This PR enhances the grammar of op attributes, so as to avoid use of "stringy" attributes where possible. Now all attributes that are Java primitives are externalized and re-parsed back automatically. This means that op factories no longer need to test for attribute values of type `String` and then manually parse that string back into the correct primitive, which makes the code more robust.
> 
> This change caused some reshuffling in the tests -- most notably, when fixing the triton test, the new logic highlighted what was probably an "issue" in the triton transformer (see related comment).

Very good. We are back to a similar position we were at ages ago (expressing various literals), but the architecture is way better.

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Marked as reviewed by psandoz (Lead).

PR Review: https://git.openjdk.org/babylon/pull/435#pullrequestreview-2875713972