[code-reflection] Integrated: first pass at mapping HATOp phase Transformers to us OpTk form

[Gary Frost]

After adding some helper classes (for simpletransforms and filtered transforms) I took a stab at refactoring the HatOp transformers. 

More work to do

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Commit messages:
 - first pass at mapping HATOp phase Transformers to us  OpTk form

Changes: https://git.openjdk.org/babylon/pull/621/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=621&range=00
  Stats: 1580 lines in 34 files changed: 676 ins; 704 del; 200 mod
  Patch: https://git.openjdk.org/babylon/pull/621.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/621/head:pull/621

PR: https://git.openjdk.org/babylon/pull/621