[code-reflection] Integrated: Experiments - considering replacing Layout with Schema

[Gary Frost]

As we look at Ptr capture in SSA we have an opportunity to replace Layouts with Schemas

-------------

Commit messages:
 - Experiments - considering replacing Layout with Schema

Changes: https://git.openjdk.org/babylon/pull/151/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=151&range=00
  Stats: 1584 lines in 8 files changed: 1407 ins; 120 del; 57 mod
  Patch: https://git.openjdk.org/babylon/pull/151.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/151/head:pull/151

PR: https://git.openjdk.org/babylon/pull/151