hg: shenandoah/jdk10: ShConcurrentThread races with set_gc_state_bit

[ashipile at redhat.com]

Changeset: 544322604347
Author:    shade
Date:      2018-01-16 20:23 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/rev/544322604347

ShConcurrentThread races with set_gc_state_bit

! src/hotspot/share/gc/shenandoah/shenandoahConcurrentThread.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp