[lworld] Integrated: 8335770: [lworld] improve javap code coverage

[Vicente Romero]

adding tests to improve javap code coverage for value classes

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Commit messages:
 - 8335770: [lworld] improve javap code coverage

Changes: https://git.openjdk.org/valhalla/pull/1157/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1157&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335770
  Stats: 131 lines in 3 files changed: 125 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/valhalla/pull/1157.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1157/head:pull/1157

PR: https://git.openjdk.org/valhalla/pull/1157