hg: shenandoah/jdk: Pre-filter oops before enqueing them in SBS slowpaths

[ashipile at redhat.com]

Changeset: 0d13e6b3a86a
Author:    shade
Date:      2018-06-19 10:45 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/0d13e6b3a86a

Pre-filter oops before enqueing them in SBS slowpaths

! src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.cpp
! src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.hpp
! src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.inline.hpp