hg: jdk/sandbox: 8199462: Use Reference.reachabilityFence in direct ByteBuffer methods

[chris.hegarty at oracle.com]

Changeset: 7c795d301dbf
Author:    psandoz
Date:      2018-03-12 16:09 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/7c795d301dbf

8199462: Use Reference.reachabilityFence in direct ByteBuffer methods
Reviewed-by: psandoz, vlivanov, plevart
Contributed-by: ben_walsh at uk.ibm.com

! src/java.base/share/classes/java/lang/ref/Reference.java
! src/java.base/share/classes/java/nio/Direct-X-Buffer-bin.java.template
! src/java.base/share/classes/java/nio/Direct-X-Buffer.java.template
! src/java.base/share/classes/java/nio/MappedByteBuffer.java
! src/java.base/share/classes/java/nio/X-Buffer.java.template
! test/jdk/java/lang/ref/ReachabilityFenceTest.java