RFR: 8288139: JavaThread touches oop after GC barrier is detached [v3]

[Daniel D. Daugherty]

> Update SharedRuntime::get_java_tid() to verify that the calling thread is safely
> accessing its own threadObj(). This check uses the new is_gc_barrier_detached()
> function added by [JDK-8288497](https://bugs.openjdk.org/browse/JDK-8288497) add support for JavaThread::is_gc_barrier_detached().
> 
> The above check was used to reproduce the failure mode without Shenandoah
> and the remainder of the fix relocates the offending code from
> ThreadsSMRSupport::remove_thread() to Threads::remove(). The work of
> removed the 'tid' entry from the ThreadIdTable is still done under the
> protection of the Threads_lock.
> 
> This fix along with the fix for JDK-8288497 has been tested in Mach5 Tier[1-8].
> There are no related failures in Mach5 Tier[1-7]; Mach5 Tier8 is still running.

Daniel D. Daugherty has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - update after 8288497 v01 code review changes
 - Merge branch 'JDK-8288497' into JDK-8288139
 - update after 8288497 v00 code review changes
 - Merge branch 'JDK-8288497' into JDK-8288139
 - 8288139: JavaThread touches oop after GC barrier is detached

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

Changes:
  - all: https://git.openjdk.org/jdk19/pull/21/files
  - new: https://git.openjdk.org/jdk19/pull/21/files/1811bc14..a7302d19

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk19&pr=21&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk19&pr=21&range=01-02

  Stats: 6 lines in 3 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk19/pull/21.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/21/head:pull/21

PR: https://git.openjdk.org/jdk19/pull/21