RFR: 8279645: JFR: The cacheEventType in Dispatcher is never assigned

[Erik Gahlin]

Hi,

Could I have review of a bug fix that assign the last event type to the cache when dispatching events for event streaming.

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.java.net/jdk/pull/6996/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6996&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279645
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6996.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6996/head:pull/6996

PR: https://git.openjdk.java.net/jdk/pull/6996