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rev 55532 : 8223582: [lworld] WeakReference of an inline type should throw

@@ -28,10 +28,13 @@
  * Phantom reference objects, which are enqueued after the collector
  * determines that their referents may otherwise be reclaimed.  Phantom
  * references are most often used to schedule post-mortem cleanup actions.
+ * <p>
+ * The referent must not be an instance of an inline class; such a value
+ * can never have another reference to it and cannot be held in a reference type.
  * <p> Suppose the garbage collector determines at a certain point in time
  * that an object is <a href="package-summary.html#reachability">
  * phantom reachable</a>.  At that time it will atomically clear
  * all phantom references to that object and all phantom references to

@@ -70,10 +73,12 @@
      * it will never be enqueued.
      * @param referent the object the new phantom reference will refer to
      * @param q the queue with which the reference is to be registered,
      *          or {@code null} if registration is not required
+     * @throws IllegalArgumentException if the referent is an instance of an
+     *         {@link Class#isInlineClass() inlineClass}
     public PhantomReference(T referent, ReferenceQueue<? super T> q) {
         super(referent, q);
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