RFR: 8265933: Move Java monitor related fields from class Thread to JavaThread

[Robbin Ehn]

On Tue, 27 Apr 2021 18:08:19 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

> Hi,
> 
> Please review the following change. Fields in class Thread related to Java object monitors like _current_pending_monitor, _current_pending_monitor_is_from_java, _current_waiting_monitor and _Stalled should be moved to the JavaThread class. Members _OnTrap and _TypeTag were grouped together with _Stalled but are not used so I removed them. It seems they were part of the ObjectMonitor implementation at some point but I couldn't find how they were used.
> Tested in mach5 tier1-2.
> 
> Thanks,
> Patricio

Marked as reviewed by rehn (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/3722