[code-reflection] RFR: Simple model testing when lowering

[Paul Sandoz]

Suggested approach to test lowering of models without interpretation or bytecode generation and execution, similar to how models produced by the compiler are tested.

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Commit messages:
 - Simple model testing when lowering

Changes: https://git.openjdk.org/babylon/pull/11/files
 Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=11&range=00
  Stats: 210 lines in 3 files changed: 209 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/11.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/11/head:pull/11

PR: https://git.openjdk.org/babylon/pull/11