hg: shenandoah/jdk8u/hotspot: Workaround VM crash with JNI Weak Refs handling

[ashipile at redhat.com]

Changeset: ba692039a40a
Author:    shade
Date:      2018-02-07 12:16 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/ba692039a40a

Workaround VM crash with JNI Weak Refs handling

! src/share/vm/memory/referenceProcessor.cpp
+ test/gc/shenandoah/jni/TestJNIGlobalRefs.java
+ test/gc/shenandoah/jni/TestJNIGlobalRefs.sh
+ test/gc/shenandoah/jni/libTestJNIGlobalRefs.c