hg: shenandoah/jdk: various C2 fixes

[rwestrel at redhat.com]

Changeset: 59dcb280ef02
Author:    roland
Date:      2018-06-27 11:46 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/59dcb280ef02

various C2 fixes

! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.hpp
! src/hotspot/share/opto/arraycopynode.cpp
! src/hotspot/share/opto/loopopts.cpp