hg: shenandoah/jdk8/hotspot: Cleanup weak JNI refs when not doing reference processing

[rkennke at redhat.com]

Changeset: 353510f8073a
Author:    rkennke
Date:      2019-12-13 13:49 +0100
URL:       https://hg.openjdk.java.net/shenandoah/jdk8/hotspot/rev/353510f8073a

Cleanup weak JNI refs when not doing reference processing
Reviewed-by: zgu

! src/share/vm/gc_implementation/shenandoah/shenandoahConcurrentMark.cpp
! src/share/vm/gc_implementation/shenandoah/shenandoahConcurrentMark.hpp
! src/share/vm/gc_implementation/shenandoah/shenandoahTraversalGC.cpp