RFR: 8288139: JavaThread touches oop after GC barrier is detached [v4]

[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 pull request now contains 10 commits:

 - Merge branch 'master' into JDK-8288139
 - update after 8288497 v01 code review changes
 - Merge branch 'JDK-8288497' into JDK-8288139
 - Rename cannot_access_oops_safely to is_oop_safe and invert the function's logic.
 - update after 8288497 v00 code review changes
 - Merge branch 'JDK-8288497' into JDK-8288139
 - Resolve some code review comments on v00.
 - Merge branch 'master' into JDK-8288497
 - 8288139: JavaThread touches oop after GC barrier is detached
 - 8288497: add support for JavaThread::is_gc_barrier_detached()

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Changes: https://git.openjdk.org/jdk19/pull/21/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=21&range=03
  Stats: 22 lines in 4 files changed: 9 ins; 6 del; 7 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