[jdk21u-dev] RFR: 8319548: Unexpected internal name for Filler array klass causes error in VisualVM

[Aleksey Shipilev]

Clean backport to improve heap dump reliability w.r.t. filler objects. Only happens after JDK 19.

Additional testing:
 - [x] Affected test still passes

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Commit messages:
 - Backport 05745e3f1d56f71d7647e81fa5933c9f4ed18430

Changes: https://git.openjdk.org/jdk21u-dev/pull/123/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=123&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319548
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/123.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/123/head:pull/123

PR: https://git.openjdk.org/jdk21u-dev/pull/123