[lworld] Integrated: 8350763: [lworld] InlineKlass::flat_array_klass hits assert(has_non_atomic_layout()) failed: Must be

[Frederic Parain]

Check layout availability before creating a flat array.

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Commit messages:
 - Check layout availability in  null-restricted array creation

Changes: https://git.openjdk.org/valhalla/pull/1380/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1380&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350763
  Stats: 6 lines in 1 file changed: 2 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/1380.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1380/head:pull/1380

PR: https://git.openjdk.org/valhalla/pull/1380