hg: shenandoah/jdk9/hotspot: Make sure to sync local and global evac-in-progress flags correctly.

[roman at kennke.org]

Changeset: b24395051cc1
Author:    rkennke
Date:      2016-10-31 17:45 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/b24395051cc1

Make sure to sync local and global evac-in-progress flags correctly.

! src/share/vm/gc/shenandoah/shenandoahConcurrentThread.cpp
! src/share/vm/runtime/thread.cpp
+ test/gc/shenandoah/EvilSyncBug.java