hg: jdk/sandbox: 8210187: Explicit barriers for C2

[chris.hegarty at oracle.com]

Changeset: 8123901bc3d1
Author:    rkennke
Date:      2018-08-31 16:28 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/8123901bc3d1

8210187: Explicit barriers for C2
Reviewed-by: eosterlund, shade, roland, pliden

! src/hotspot/share/gc/shared/c2/barrierSetC2.hpp
! src/hotspot/share/opto/graphKit.cpp
! src/hotspot/share/opto/graphKit.hpp
! src/hotspot/share/opto/library_call.cpp
! src/hotspot/share/opto/stringopts.cpp