[code-reflection] RFR: Enable sealing of an operation [v12]

[Paul Sandoz]

On Thu, 28 Aug 2025 15:18:28 GMT, Mourad Abbay <mabbay at openjdk.org> wrote:

>> Allow for an unbound operation to be sealed, causing it to be copied when we append it to a block builder.
>
> Mourad Abbay has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Apply review comments

Marked as reviewed by psandoz (Lead).

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PR Review: https://git.openjdk.org/babylon/pull/425#pullrequestreview-3165580492