[code-reflection] RFR: Unify common code of SwitchStatementOp and SwitchExpressionOp [v4]

[Mourad Abbay]

> Unify common code of SwitchStatementOp and SwitchExpressionOp.

Mourad Abbay has updated the pull request incrementally with two additional commits since the last revision:

 - Update JavaSwitchOp.lower
 - Apply suggestions

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Changes:
  - all: https://git.openjdk.org/babylon/pull/222/files
  - new: https://git.openjdk.org/babylon/pull/222/files/4a35d1eb..461609ae

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=222&range=03
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=222&range=02-03

  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/babylon/pull/222.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/222/head:pull/222

PR: https://git.openjdk.org/babylon/pull/222