[code-reflection] RFR: Drop ClosureOp and ClosureOpCall

[Paul Sandoz]

On Fri, 7 Nov 2025 10:33:18 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> As we have dropped support for quoted structured lambdas, the corresponding code model `ClosureOp` is no longer used and can be removed as well. That also drags `ClosureOpCall`, as that op is only used to call closure ops. And the related `TestClosureOps` test.
> 
> I didn't find any occurence of the removed class in examples/HAT.

Looks good!

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Marked as reviewed by psandoz (Lead).

PR Review: https://git.openjdk.org/babylon/pull/668#pullrequestreview-3434609047