[lworld] RFR: 8344590: [lworld] non-abstract value classes can not be sealed or non-sealed

[Vicente Romero]

Non abstract value classes can't be sealed or non-sealed

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Commit messages:
 - 8344590: [lworld] non-abstract value classes can not be sealed or non-sealed

Changes: https://git.openjdk.org/valhalla/pull/1305/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1305&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344590
  Stats: 70 lines in 4 files changed: 64 ins; 3 del; 3 mod
  Patch: https://git.openjdk.org/valhalla/pull/1305.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1305/head:pull/1305

PR: https://git.openjdk.org/valhalla/pull/1305