[lworld] Integrated: 8329106: [lworld] adding support for value classes in javap, plus test refactorings

[Vicente Romero]

adding support in javap to show if a class is a value class, plus some test clean-up and refactorings

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Commit messages:
 - 8329106: [lworld] adding support for value classes in javap, plus test refactorings

Changes: https://git.openjdk.org/valhalla/pull/1066/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1066&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329106
  Stats: 1495 lines in 11 files changed: 71 ins; 1409 del; 15 mod
  Patch: https://git.openjdk.org/valhalla/pull/1066.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1066/head:pull/1066

PR: https://git.openjdk.org/valhalla/pull/1066