RFR: 8291428: JFR: 'jfr print' displays incorrect timestamps during DST

[Erik Gahlin]

Could I have a review of change that fixes incorrect timestamp during DST. For details see issue.

Testing: jdk/jdk/jfr

Thanks
Erik

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

Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/9666/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9666&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291428
  Stats: 18 lines in 5 files changed: 11 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/9666.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9666/head:pull/9666

PR: https://git.openjdk.org/jdk/pull/9666