RFR: 8282200: ShouldNotReachHere() reached by AsyncGetCallTrace after JDK-8280422 [v3]

[Johannes Bechberger]

> Fixes the mentioned bug by replacing the check in AsyncGetCallTrace using the newly introduced method `JavaThread::thread_from_jni_environment`.

Johannes Bechberger has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Add changes by David Holmes

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7559/files
  - new: https://git.openjdk.java.net/jdk/pull/7559/files/9f701eb0..ca295d34

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7559&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7559&range=01-02

  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 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