[jdk13u-dev] RFR: 8282947: JFR: Dump on shutdown live-locks in some conditions

[Ekaterina Vergizova]

I'd like to backport JDK-8282947 to 13u for parity with 11u.
The patch applies cleanly.
Tested with jdk/jfr and tier1 tests; added test fails without the patch and passes with it on Linux.

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Commit messages:
 - Backport 63eb0b7e8606dd9cd145e92eeeb744ff5b7be569

Changes: https://git.openjdk.org/jdk13u-dev/pull/395/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk13u-dev&pr=395&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8282947
  Stats: 66 lines in 3 files changed: 62 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk13u-dev/pull/395.diff
  Fetch: git fetch https://git.openjdk.org/jdk13u-dev pull/395/head:pull/395

PR: https://git.openjdk.org/jdk13u-dev/pull/395