RFR: JDK-8276650: GenGraphs does not produce deterministic output

[Mandy Chung]

The dot graph should print the edges in alphatical order.   A simple fix to sort the edges before printing them.

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Commit messages:
 - JDK-8276650: GenGraphs does not produce deterministic output

Changes: https://git.openjdk.java.net/jdk/pull/6266/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6266&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276650
  Stats: 41 lines in 2 files changed: 2 ins; 1 del; 38 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6266.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6266/head:pull/6266

PR: https://git.openjdk.java.net/jdk/pull/6266