RFR: 8307738: JFR: EventStream.openRepository() drops events

[Erik Gahlin]

Could I have a review of a fix that prevents events to be dropped in case an end time has been set for a stream.

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/14103/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14103&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307738
  Stats: 18 lines in 2 files changed: 9 ins; 2 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/14103.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14103/head:pull/14103

PR: https://git.openjdk.org/jdk/pull/14103