[code-reflection] Integrated: Experiments with HatPtrOp

[Gary Frost]

Apologies for noise.  Forgot to add the HatOpPtr file ...

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Commit messages:
 - Experiments with HatPtrOp

Changes: https://git.openjdk.org/babylon/pull/125/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=125&range=00
  Stats: 240 lines in 2 files changed: 240 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/babylon/pull/125.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/125/head:pull/125

PR: https://git.openjdk.org/babylon/pull/125