hg: jdk/jdk: 8191798: redo nested ThreadsListHandle to drop Threads_lock

[daniel.daugherty at oracle.com]

Changeset: a87f2e7a527c
Author:    dcubed
Date:      2018-05-02 16:47 -0400
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/a87f2e7a527c

8191798: redo nested ThreadsListHandle to drop Threads_lock
Summary: Refactor Thread hazard ptrs and nested ThreadsLists into SafeThreadsListPtr.
Reviewed-by: dcubed, eosterlund, rehn
Contributed-by: erik.osterlund at oracle.com, daniel.daugherty at oracle.com

! src/hotspot/share/runtime/thread.cpp
! src/hotspot/share/runtime/thread.hpp
! src/hotspot/share/runtime/threadSMR.cpp
! src/hotspot/share/runtime/threadSMR.hpp
! src/hotspot/share/runtime/threadSMR.inline.hpp
! src/hotspot/share/services/threadService.hpp
! test/hotspot/jtreg/runtime/ErrorHandling/NestedThreadsListHandleInErrorHandlingTest.java
! test/hotspot/jtreg/runtime/ErrorHandling/ThreadsListHandleInErrorHandlingTest.java