[code-reflection] RFR: Test Switch Expression lowering when case is constant

[Mourad Abbay]

Test Switch Expression lowering when case is constant.

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Commit messages:
 - Merge branch 'code-reflection' into test-sw-lowering
 - Remove misleading comment
 - Test switch expression lowering when case is constant
 - Remove switch expression lowering tests

Changes: https://git.openjdk.org/babylon/pull/169/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=169&range=00
  Stats: 188 lines in 3 files changed: 119 ins; 6 del; 63 mod
  Patch: https://git.openjdk.org/babylon/pull/169.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/169/head:pull/169

PR: https://git.openjdk.org/babylon/pull/169