hg: shenandoah/jdk11: guard shared code changes with UseShenandoahGC

[rwestrel at redhat.com]

Changeset: a09026eb1908
Author:    roland
Date:      2018-10-17 17:03 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk11/rev/a09026eb1908

guard shared code changes with UseShenandoahGC

! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp
! src/hotspot/share/opto/block.hpp
! src/hotspot/share/opto/cfgnode.cpp
! src/hotspot/share/opto/compile.cpp
! src/hotspot/share/opto/lcm.cpp
! src/hotspot/share/opto/library_call.cpp
! src/hotspot/share/opto/loopPredicate.cpp
! src/hotspot/share/opto/loopnode.cpp
! src/hotspot/share/opto/macro.cpp
! src/hotspot/share/opto/multnode.cpp
! src/hotspot/share/opto/superword.cpp
! src/hotspot/share/opto/type.cpp