RFR: 8294242: JFR: jfr print doesn't handle infinite duration well

[Erik Gahlin]

Hi,

Could I have review of a fix that improves the output of the jfr tool when there are event values that are infinite

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/10497/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10497&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294242
  Stats: 35 lines in 5 files changed: 30 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/10497.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10497/head:pull/10497

PR: https://git.openjdk.org/jdk/pull/10497