[jdk13u-dev] RFR: 8232905: JFR fails with assertion: assert(t->unflushed_size() == 0) failed: invariant

[Ekaterina Vergizova]

I'd like to backport JDK-8232905 to 13u for parity with 11u.
The patch applies cleanly.
Tested with tier1 and jdk/jfr tests.

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Commit messages:
 - Backport 24bff84cb3516cb0ae46b3b8773eba205e1eb8ab

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/134/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=134&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8232905
  Stats: 12 lines in 1 file changed: 5 ins; 6 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/134.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/134/head:pull/134

PR: https://git.openjdk.java.net/jdk13u-dev/pull/134