RFR: 8309928: JFR: View issues

[Erik Gahlin]

Could I have review of a few fixes to the view command.

Testing: jdk/jdk/jfr

Thanks
Erik

-------------

Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/14451/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14451&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309928
  Stats: 6 lines in 3 files changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/14451.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14451/head:pull/14451

PR: https://git.openjdk.org/jdk/pull/14451