[code-reflection] Integrated: Experimenting using Schema to hide layouts and interface with ptrs

[Gary Frost]

I think its time to hide layouts for iface mappings.  

Here we test the idea of building a schema directly (which in turn builds the layout).

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Commit messages:
 - Experimenting using Schema to hide layouts and interface with ptrs

Changes: https://git.openjdk.org/babylon/pull/147/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=147&range=00
  Stats: 192 lines in 2 files changed: 105 ins; 33 del; 54 mod
  Patch: https://git.openjdk.org/babylon/pull/147.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/147/head:pull/147

PR: https://git.openjdk.org/babylon/pull/147