store / retrieve instanceHandle from View

Reviewed By: shergin, achen1

Differential Revision: D8074014

fbshipit-source-id: aee0d41e0e9da44e8748f47da04dcd76dbe96d8d

ReactAndroid/src/test/java/com/facebook/react/fabric/FabricReconcilerTest.java

@@ -109,6 +109,7 @@ public class FabricReconcilerTest {
       node = new ReactShadowNodeImpl();
     }
     node.setReactTag(tag);
+    node.setViewClassName("View");
     node.setThemedContext(mock(ThemedReactContext.class));
     return node;
   }