[code-reflection] Integrated: Hat cleanup phases

[Gary Frost]

Converted a few Phases to records. 

Removed some duplicate code.  

Leaned op OpTK helpers.

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Commit messages:
 - Phase transformation housekeeping
 - Phase transformation housekeeping

Changes: https://git.openjdk.org/babylon/pull/770/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=770&range=00
  Stats: 359 lines in 21 files changed: 153 ins; 169 del; 37 mod
  Patch: https://git.openjdk.org/babylon/pull/770.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/770/head:pull/770

PR: https://git.openjdk.org/babylon/pull/770