hg: jdk9/hs-comp/hotspot: 8036851: volatile double accesses are not explicitly atomic in C2

[albert.noll at oracle.com]

Changeset: 446bb44e5367
Author:    anoll
Date:      2014-05-06 09:17 +0200
URL:       http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/446bb44e5367

8036851: volatile double accesses are not explicitly atomic in C2
Summary: The C2 structure is adapted to distinguish between volatile and non-volatile double accesses.
Reviewed-by: twisti, kvn
Contributed-by: Tobias Hartmann <tobias.hartmann at oracle.com>

! src/share/vm/opto/graphKit.cpp
! src/share/vm/opto/memnode.cpp
! src/share/vm/opto/memnode.hpp