[lworld] Integrated: 8334313: [lworld] only concrete value classes should be listed in the LoadableDescriptors attribute

[Vicente Romero]

do not add abstract value classes to the LoadableDescriptors attribute

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Commit messages:
 - 8334313: [lworld] only concrete value classes should be listed in the LoadableDescriptors attribute

Changes: https://git.openjdk.org/valhalla/pull/1135/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1135&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334313
  Stats: 26 lines in 4 files changed: 5 ins; 0 del; 21 mod
  Patch: https://git.openjdk.org/valhalla/pull/1135.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1135/head:pull/1135

PR: https://git.openjdk.org/valhalla/pull/1135