Add PhantomRef based YogaNode subclass

Summary: Adds a subclass of `YogaNodeJNIBase` that uses `PhantomReference` for deallocating native memory rather than `Object#finalize()`. This should help making garbage collection more efficient.

Reviewed By: amir-shalem

Differential Revision: D16182667

fbshipit-source-id: d310fdb6af184168c43462b24f5e18ab5d0d7ad0

java/com/facebook/yoga/YogaNode.java

@@ -10,11 +10,11 @@ import javax.annotation.Nullable;
 
 public abstract class YogaNode {
   public static YogaNode create() {
-    return new YogaNodeJNIBase();
+    return new YogaNodeJNIFinalizer();
   }
 
   public static YogaNode create(YogaConfig config) {
-    return new YogaNodeJNIBase(config);
+    return new YogaNodeJNIFinalizer(config);
   }
 
   public abstract void reset();