hg: shenandoah/jdk: Make weakref processing always use Executor

[roman at kennke.org]

Changeset: 3260140fc32b
Author:    rkennke
Date:      2018-08-09 16:29 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/3260140fc32b

Make weakref processing always use Executor

! src/hotspot/share/gc/shared/referenceProcessor.cpp
! src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp
! src/hotspot/share/gc/shenandoah/shenandoahUtils.hpp