[code-reflection] RFR: Lowering passes on transformer

[Paul Sandoz]

The switch operation lowering implementation needs to pass on the given operation transformer when lowering nested content. A given operation transformer may be one created when lowering a try or synchronized operation which may need to insert code when exiting non-exceptionally from the scope of the operation e.g., inserting code before a return operation.

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Commit messages:
 - Lowering passes on transformer

Changes: https://git.openjdk.org/babylon/pull/492/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=492&range=00
  Stats: 5 lines in 1 file changed: 0 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/babylon/pull/492.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/492/head:pull/492

PR: https://git.openjdk.org/babylon/pull/492