[code-reflection] RFR: Move ANF code to test code

[Paul Sandoz]

Move ANF dialect and transformer to test code.

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Commit messages:
 - Move ANF code to test

Changes: https://git.openjdk.org/babylon/pull/444/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=444&range=00
  Stats: 46 lines in 5 files changed: 0 ins; 42 del; 4 mod
  Patch: https://git.openjdk.org/babylon/pull/444.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/444/head:pull/444

PR: https://git.openjdk.org/babylon/pull/444