RFR: 8276125: RunThese24H.java SIGSEGV in JfrThreadGroup::thread_group_id

[Markus Grönlund]

Greetings,

please help review this changeset.

Details are listed in the the JIRA issue.

Testing: jdk_jfr

Thanks
Markus

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Commit messages:
 - 8276125

Changes: https://git.openjdk.java.net/jdk/pull/6702/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6702&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276125
  Stats: 6 lines in 1 file changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6702.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6702/head:pull/6702

PR: https://git.openjdk.java.net/jdk/pull/6702