hg: shenandoah/jdk: 2 new changesets

[ashipile at redhat.com]

Changeset: 58b489aaaae4
Author:    shade
Date:      2018-06-06 15:22 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/58b489aaaae4

Reinstate reference processing shortcut, missing after merge

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

Changeset: 02bb7f0535b9
Author:    shade
Date:      2018-06-06 17:42 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/02bb7f0535b9

C1 xchg handling is broken: no item available after WB

! src/hotspot/share/gc/shenandoah/c1/shenandoahBarrierSetC1.cpp