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

[Mourad Abbay]

Test Switch Expression lowering when case is pattern.

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Commit messages:
 - Test lowering of switch expression when case is pattern.
 - Create overloads of method toValue.
 - Merge branch 'code-reflection' into test-sw-lowering
 - 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/191/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=191&range=00
  Stats: 361 lines in 3 files changed: 283 ins; 6 del; 72 mod
  Patch: https://git.openjdk.org/babylon/pull/191.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/191/head:pull/191

PR: https://git.openjdk.org/babylon/pull/191