hg: jdk/jdk: 8221102: Allow GC threads to participate in threads claiming protocol

[kim.barrett at oracle.com]

Changeset: 9559ba212c18
Author:    kbarrett
Date:      2019-04-02 13:08 -0400
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/9559ba212c18

8221102: Allow GC threads to participate in threads claiming protocol
Summary: Expand claim counter from 1bit to uintx, with rare overflow handling.
Reviewed-by: tschatzl, rkennke

! src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
! src/hotspot/share/gc/shared/genCollectedHeap.cpp
! src/hotspot/share/gc/shared/strongRootsScope.cpp
! src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp
! src/hotspot/share/gc/z/zRootsIterator.cpp
! src/hotspot/share/runtime/sweeper.cpp
! src/hotspot/share/runtime/thread.cpp
! src/hotspot/share/runtime/thread.hpp
+ test/hotspot/gtest/runtime/test_threads.cpp