RFR: 6801: Rewrite stackdepth setting rule for speed

[Henrik Dafgård]

Rewrites the stackdepth setting rule to complete in one pass over all events with stacktraces. Also sorts the resulting
list of event types with truncated traces.

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Commit messages:
 - Fix formatting
 - Rewrite stackdepth setting rule for speed

Changes: https://git.openjdk.java.net/jmc/pull/76/files
 Webrev: https://webrevs.openjdk.java.net/jmc/76/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6801
  Stats: 4487 lines in 2 files changed: 24 ins; 29 del; 4434 mod
  Patch: https://git.openjdk.java.net/jmc/pull/76.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/76/head:pull/76

PR: https://git.openjdk.java.net/jmc/pull/76