[code-reflection] RFR: Lower SwitchExpressionOp [v3]

[Mourad Abbay]

> Lowering of SwitchExpressionOp

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

 - Remove unnecessary code
 - Remove unnecessary comments
 - Make JavaSwitchFallThroughOp lowerable
 - Remove params of blocks that represents label bodies

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Changes:
  - all: https://git.openjdk.org/babylon/pull/45/files
  - new: https://git.openjdk.org/babylon/pull/45/files/1d7fcffa..c40d0e6e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=45&range=02
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=45&range=01-02

  Stats: 78 lines in 2 files changed: 36 ins; 35 del; 7 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