RFR: 8293167: Memory leak in JfrThreadSampler if stackdepth is larger than default (64)

[Markus Grönlund]

Greetings,

please help review this fix that address a memory leak in the JfrThreadSampler when using a stackdepth larger than default (64).

Please see the JIRA issue for details.

Testing: jdk_jfr, stress

Thanks
Markus

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Commit messages:
 - 8293167

Changes: https://git.openjdk.org/jdk/pull/10129/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10129&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293167
  Stats: 63 lines in 6 files changed: 33 ins; 3 del; 27 mod
  Patch: https://git.openjdk.org/jdk/pull/10129.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10129/head:pull/10129

PR: https://git.openjdk.org/jdk/pull/10129