RFR: 8330533: JFR: LocalDateTime should not use milliseconds since epoch

[Erik Gahlin]

Could I have a review of a bug fix that changes the parameter passed to LocalDateTime to an Instant.

Testing: jdk/jdk/jfr + manual inspection of -Xlog:jfr to ensure filenames use UTC when an incorrect time zone is used.

Thanks
Erik

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Commit messages:
 - Use Instant.now()
 - Initial

Changes: https://git.openjdk.org/jdk/pull/18827/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18827&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330533
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18827.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18827/head:pull/18827

PR: https://git.openjdk.org/jdk/pull/18827