[code-reflection] Integrated: Sealed HATPhases (transformer) heierarchy and provided access to Kern…

[Gary Frost]

Sealed HATPhases (transformer) heierarchy
Phases now have access to KernelCallGraph to allow them to update/access KernelCallGraph state.
Move some code down to optkl which no longer depends on HAT

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Commit messages:
 - Sealed HATPhases (transformer) heierarchy and provided access to KernelCallGraph

Changes: https://git.openjdk.org/babylon/pull/782/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=782&range=00
  Stats: 780 lines in 52 files changed: 301 ins; 209 del; 270 mod
  Patch: https://git.openjdk.org/babylon/pull/782.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/782/head:pull/782

PR: https://git.openjdk.org/babylon/pull/782