RFR: 8281267: VM HeapDumper dumps array classes several times

[Alex Menkov]

ClassLoaderDataGraph::classes_do description says:
// Walking classes through the ClassLoaderDataGraph include array classes.
So do_load_class callback should not dump arrays for the classes and dumper doesn't need to call Universe::basic_type_classes_do (array classes for primitive types are also reported by ClassLoaderDataGraph::classes_do)

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Commit messages:
 - JDK-8281267

Changes: https://git.openjdk.java.net/jdk/pull/7384/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7384&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281267
  Stats: 361 lines in 2 files changed: 338 ins; 10 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7384.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7384/head:pull/7384

PR: https://git.openjdk.java.net/jdk/pull/7384