hg: jdk9/sandbox/jdk: Add memory fence methods.

[paul.sandoz at oracle.com]

Changeset: 046a17dcf469
Author:    psandoz
Date:      2015-09-23 14:55 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/046a17dcf469

Add memory fence methods.

! src/java.base/share/classes/java/lang/invoke/VarHandle.java
! src/java.base/share/classes/sun/misc/Unsafe.java