RFR: 8294000: Filler array klass should be in jdk/vm/internal, not in java/vm/internal

[Thomas Schatzl]

Hi all,

  can I have reviews for the move of the internal filler array klass from `java/vm/internal/` to `jdk/vm/internal` - I noticed that typo in some recent `jmap` dump. All internal klasses are in the `jdk.` package... idk how this slipped through the original change.

With this change it shows up as
`   2:           428       13291728  jdk.internal.vm.FillerArray (java.base at 20-internal)`
which I believe is best.

Testing: local compilation, checking `jmap` output for instances of this klass directly, the `gc/TestFillerObjectInstantiation.java` jtreg test

Thanks,
  Thomas

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Commit messages:
 - rename

Changes: https://git.openjdk.org/jdk/pull/10336/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10336&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294000
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10336.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10336/head:pull/10336

PR: https://git.openjdk.org/jdk/pull/10336