[code-reflection] Integrated: Hat ptr op and type experiments

[Gary Frost]

Experimenting replacing iface calls with custom HatOps.HatPtr ops. 

Some maven cleanup WRT SPIRV

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Commit messages:
 - HAT Ptr OP  and Ptr Type Experiments - some maven cleanup
 - HAT Ptr OP  and Ptr Type Experiments - some maven cleanup

Changes: https://git.openjdk.org/babylon/pull/145/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=145&range=00
  Stats: 321 lines in 10 files changed: 238 ins; 71 del; 12 mod
  Patch: https://git.openjdk.org/babylon/pull/145.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/145/head:pull/145

PR: https://git.openjdk.org/babylon/pull/145