[jdk11u-dev] RFR: 8285794: AsyncGetCallTrace might acquire a lock via JavaThread::thread_from_jni_environment

[Johannes Bechberger]

Backports a fix to ensure that ASGCT does not obtain the mentioned lock. Tested with my profiling tester.

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Commit messages:
 - 8285794: AsyncGetCallTrace might acquire a lock via JavaThread::thread_from_jni_environment

Changes: https://git.openjdk.org/jdk11u-dev/pull/1537/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1537&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285794
  Stats: 9 lines in 1 file changed: 4 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1537.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1537/head:pull/1537

PR: https://git.openjdk.org/jdk11u-dev/pull/1537