[code-reflection] Integrated: hat cleanup after removing OpWrappers

[Gary Frost]

After OpWrapper removal found some opportunities to simplify code. 

This PR just provides that cleanup

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Commit messages:
 - hat cleanup after removing OpWrappers

Changes: https://git.openjdk.org/babylon/pull/544/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=544&range=00
  Stats: 674 lines in 22 files changed: 164 ins; 329 del; 181 mod
  Patch: https://git.openjdk.org/babylon/pull/544.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/544/head:pull/544

PR: https://git.openjdk.org/babylon/pull/544