Fixes the mentioned bug by replacing the check in AsyncGetCallTrace using the newly introduced method `JavaThread::thread_from_jni_environment`.
------------- Commit messages: - Fix AsyncGetCallTrace bug Changes: https://git.openjdk.java.net/jdk/pull/7559/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7559&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8282200 Stats: 25 lines in 2 files changed: 19 ins; 5 del; 1 mod Patch: https://git.openjdk.java.net/jdk/pull/7559.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/7559/head:pull/7559 PR: https://git.openjdk.java.net/jdk/pull/7559
