[code-reflection] RFR: Generate bytecode from an invokable op.

[Paul Sandoz]

The bytecode generator can easily generate bytecode for any invokable op that does not capture.

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Commit messages:
 - Reject invokable ops that capture
 - Generate bytecode from an invokeable op.

Changes: https://git.openjdk.org/babylon/pull/42/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=42&range=00
  Stats: 78 lines in 4 files changed: 65 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/babylon/pull/42.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/42/head:pull/42

PR: https://git.openjdk.org/babylon/pull/42