[code-reflection] RFR: Bytecode cleanup, renames and javadoc [v4]

[Adam Sotona]

> This PR introduces only minimal functional changes, it is mainly focused on the bytecode package cleanup and documentation.
> 
> Any comments and suggestions are welcome.
> 
> Thanks,
> Adam

Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:

  added more statistics to TestSmallCorpus

-------------

Changes:
  - all: https://git.openjdk.org/babylon/pull/228/files
  - new: https://git.openjdk.org/babylon/pull/228/files/62fbbd19..052ae605

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=228&range=03
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=228&range=02-03

  Stats: 21 lines in 1 file changed: 14 ins; 2 del; 5 mod
  Patch: https://git.openjdk.org/babylon/pull/228.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/228/head:pull/228

PR: https://git.openjdk.org/babylon/pull/228