hg: jdk/jdk13: 8227407: ZGC: C2 loads and load barriers can get separated by safepoints

[erik.osterlund at oracle.com]

Changeset: a79a819a8218
Author:    eosterlund
Date:      2019-07-29 13:57 +0200
URL:       https://hg.openjdk.java.net/jdk/jdk13/rev/a79a819a8218

8227407: ZGC: C2 loads and load barriers can get separated by safepoints
Reviewed-by: neliasso, smonteith, roland

! src/hotspot/share/gc/shared/c2/barrierSetC2.cpp
! src/hotspot/share/gc/shared/c2/barrierSetC2.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/macro.cpp
! src/hotspot/share/opto/memnode.cpp
! src/hotspot/share/opto/memnode.hpp
! src/hotspot/share/opto/superword.cpp