[lworld] RFR: 8366806: [lworld] JDI test failures

[Alex Menkov]

Fixed JVMTI GetLoadedClasses/GetClassLoaderClasses functions after array rework - RefArrayKlass/FlatArrayKlass are not reported by the functions.

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Commit messages:
 - fix

Changes: https://git.openjdk.org/valhalla/pull/1636/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1636&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366806
  Stats: 38 lines in 2 files changed: 14 ins; 21 del; 3 mod
  Patch: https://git.openjdk.org/valhalla/pull/1636.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1636/head:pull/1636

PR: https://git.openjdk.org/valhalla/pull/1636