hg: shenandoah/jdk9/hotspot: Fix memory Phis with only data uses

[rwestrel at redhat.com]

Changeset: 6df40317fac3
Author:    roland
Date:      2017-06-19 14:23 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/6df40317fac3

Fix memory Phis with only data uses

! src/share/vm/opto/cfgnode.cpp
! src/share/vm/opto/cfgnode.hpp
! src/share/vm/opto/compile.cpp
! src/share/vm/opto/memnode.cpp
! src/share/vm/opto/node.cpp
! src/share/vm/opto/phaseX.cpp
! src/share/vm/opto/shenandoahSupport.cpp