[code-reflection] RFR: Lower SwitchExpressionOp [v6]

[Mourad Abbay]

> Lowering of SwitchExpressionOp

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

 - Remove set/getBranchTarget method that accept an operation.
 - Use OpTransformer.LOWERING_TRANSFORMER.

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Changes:
  - all: https://git.openjdk.org/babylon/pull/45/files
  - new: https://git.openjdk.org/babylon/pull/45/files/98e52027..5519c859

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=45&range=05
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=45&range=04-05

  Stats: 25 lines in 2 files changed: 0 ins; 24 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/45.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/45/head:pull/45

PR: https://git.openjdk.org/babylon/pull/45