hg: shenandoah/jdk: clean up obsolete c2 code from:

[rwestrel at redhat.com]

Changeset: 94c53944cd0c
Author:    roland
Date:      2018-08-13 17:55 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/94c53944cd0c

clean up obsolete c2 code from:
- barriers are never added on constant oops
- write barriers are always expanded to IR

! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.hpp
! src/hotspot/share/opto/addnode.cpp
! src/hotspot/share/opto/arraycopynode.cpp
! src/hotspot/share/opto/callGenerator.cpp
! src/hotspot/share/opto/ifg.cpp
! src/hotspot/share/opto/lcm.cpp
! src/hotspot/share/opto/library_call.cpp
! src/hotspot/share/opto/loopnode.cpp
! src/hotspot/share/opto/matcher.cpp
! src/hotspot/share/opto/memnode.hpp
! src/hotspot/share/opto/stringopts.cpp
! src/hotspot/share/opto/type.cpp
! src/hotspot/share/opto/type.hpp