[lworld] RFR: 8346467: [lworld] Value record cannot be implicitly constructible

[Frederic Parain]

Small fix to support implicitly constructible value records.

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Commit messages:
 - Add j.l.Record as valid super type for implicitly constructible values

Changes: https://git.openjdk.org/valhalla/pull/1322/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1322&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346467
  Stats: 23 lines in 2 files changed: 22 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1322.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1322/head:pull/1322

PR: https://git.openjdk.org/valhalla/pull/1322