RFR: 8319548: Unexpected internal name for Filler array klass causes error in VisualVM

[Thomas Schatzl]

Hi all,

  please review this change that changes the filler array class name (again) after user feedback.

In particular, the previous name `Ljdk/internal/vm/FillerArray;` confuses some tools (https://github.com/oracle/visualvm/issues/523). I.e. it's not an array, but still variable sized.
This change adds the `[` array bracket, and renames the element name to not have `Array` inside to not try to pretend that the element is some other kind of array.

Testing: tier1-6

Thanks,
  Thomas

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Commit messages:
 - final name change?
 - Fix test
 - different attempt
 - suggestion

Changes: https://git.openjdk.org/jdk/pull/17155/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17155&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/jdk/pull/17155.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17155/head:pull/17155

PR: https://git.openjdk.org/jdk/pull/17155