RFR: 8287799: JFR: Less noisy platform threads with jfr print

[Erik Gahlin]

Could I have review of a PR that removes "virtual = false" from 'jfr print' if the thread is a platform thread. In case of a virtual thread, it should be sufficient to have "virtual" after the thread ID.

Testing: jdk/jdk/jfr + manual check of output for virtual and platform threads

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.java.net/jdk/pull/9014/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=9014&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287799
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9014.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9014/head:pull/9014

PR: https://git.openjdk.java.net/jdk/pull/9014