RFR: 8298379: JFR: Some UNTIMED events only sets endTime

[Markus Grönlund]

Greetings,

It was pointed out that some UNTIMED events only call set_endtime(), and not the corresponding set_starttime(), for example some events in jfrPeriodic.cpp. UNTIMED events need to have both timestamps set, because the UNTIMED parameter denotes that the user takes on the responsibility for controlling time stamping.

This change rectifies a few places by adding the corresponding set_starttime() call.

Test: jdk_jfr

Thanks
Markus

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Commit messages:
 - 8298379

Changes: https://git.openjdk.org/jdk/pull/11592/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11592&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298379
  Stats: 13 lines in 5 files changed: 9 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/11592.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11592/head:pull/11592

PR: https://git.openjdk.org/jdk/pull/11592