[code-reflection] RFR: 8373573: JavaOp.SwitchExpressionOp with unconditional pattern lowers to an invalid code model

[Mourad Abbay]

Lowering of SwitchExpressionOp that has unconditional pattern is producing an invalid model.

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Commit messages:
 - Fix lowering of SwitchExpressionOp that has unconditional pattern

Changes: https://git.openjdk.org/babylon/pull/785/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=785&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373573
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/babylon/pull/785.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/785/head:pull/785

PR: https://git.openjdk.org/babylon/pull/785