RFR: 7074: Smart pruning of graphs to make it possible to sensibly render larger graphs

[Jean-Philippe Bempel]

7074: Smart pruning of graphs to make it possible to sensibly render larger graphs

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Commit messages:
 - 7074: Smart pruning of graphs to make it possible to sensibly render larger graphs

Changes: https://git.openjdk.java.net/jmc/pull/349/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=349&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7074
  Stats: 292 lines in 5 files changed: 246 ins; 0 del; 46 mod
  Patch: https://git.openjdk.java.net/jmc/pull/349.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/349/head:pull/349

PR: https://git.openjdk.java.net/jmc/pull/349