hg: shenandoah/jdk: [cherry pick] 8214172: GC interface entry points for loop opts

[rwestrel at redhat.com]

Changeset: 453f22c7b06b
Author:    roland
Date:      2018-11-20 15:41 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/453f22c7b06b

[cherry pick] 8214172: GC interface entry points for loop opts
Reviewed-by: kvn, rkennke

! src/hotspot/share/gc/shared/c2/barrierSetC2.hpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.hpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.hpp
! src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp
! src/hotspot/share/gc/z/c2/zBarrierSetC2.hpp
! src/hotspot/share/opto/compile.cpp
! src/hotspot/share/opto/compile.hpp
! src/hotspot/share/opto/loopnode.cpp
! src/hotspot/share/opto/loopnode.hpp
! src/hotspot/share/opto/macro.cpp
! src/hotspot/share/opto/phase.cpp
! src/hotspot/share/opto/phase.hpp
! src/hotspot/share/opto/subnode.cpp