hg: jdk9/sandbox/jdk: Add VarHandle.compareAndExchange{Volatile, Acquire, Release}.

[paul.sandoz at oracle.com]

Changeset: d5c1bee59e2a
Author:    psandoz
Date:      2015-09-10 14:44 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/d5c1bee59e2a

Add VarHandle.compareAndExchange{Volatile, Acquire, Release}.
The corresponding Unsafe methods need to be made intrinsic and
the current implementations while functional are incorrect with
respect to the witness on failure.

! src/java.base/share/classes/java/lang/invoke/VarForm.java
! src/java.base/share/classes/java/lang/invoke/VarHandle.java
! src/java.base/share/classes/java/lang/invoke/VarHandleBooleans.java
! src/java.base/share/classes/java/lang/invoke/VarHandleByteArrayViews.java
! src/java.base/share/classes/java/lang/invoke/VarHandleBytes.java
! src/java.base/share/classes/java/lang/invoke/VarHandleChars.java
! src/java.base/share/classes/java/lang/invoke/VarHandleDoubles.java
! src/java.base/share/classes/java/lang/invoke/VarHandleFloats.java
! src/java.base/share/classes/java/lang/invoke/VarHandleGuards.java
! src/java.base/share/classes/java/lang/invoke/VarHandleIntArrayViews.java
! src/java.base/share/classes/java/lang/invoke/VarHandleInts.java
! src/java.base/share/classes/java/lang/invoke/VarHandleLongs.java
! src/java.base/share/classes/java/lang/invoke/VarHandleObjects.java
! src/java.base/share/classes/java/lang/invoke/VarHandleShorts.java
! src/java.base/share/classes/java/lang/invoke/VarHandles.java
! src/java.base/share/classes/java/lang/invoke/X-VarHandle.java.template
! src/java.base/share/classes/sun/misc/Unsafe.java
! test/java/lang/invoke/X-VarHandleTest.java.template