RFR: 8294670: Enhanced switch statements have an implicit default which does not complete normally

Mon Oct 3 15:08:58 UTC 2022

When a synthetic `default` is generated for enhanced switch, it never completes normally, which should be used when detecting liveness after the switch statement, which is what this patch is trying to do.

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Commit messages:
 - 8294670: Enhanced switch statements have an implicit default which does not complete normally

Changes: https://git.openjdk.org/jdk/pull/10540/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10540&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294670
  Stats: 119 lines in 4 files changed: 114 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/10540.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10540/head:pull/10540

PR: https://git.openjdk.org/jdk/pull/10540