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

[Mourad Abbay]

> 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:

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Changes:
  - all: https://git.openjdk.org/babylon/pull/425/files
  - new: https://git.openjdk.org/babylon/pull/425/files/bb551fc4..15cc22f4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=425&range=11
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=425&range=10-11

  Stats: 20 lines in 2 files changed: 12 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/babylon/pull/425.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/425/head:pull/425

PR: https://git.openjdk.org/babylon/pull/425