Fabric: Using a proper Component Descriptor for node cloning

Summary: To clone a ShadowNode we must use node's ComponentDescriptot, not parent node's one.

Reviewed By: mdvacca

Differential Revision: D7738583

fbshipit-source-id: 83656f9a761530cdaedf65663ae28b3119af75f5

ReactCommon/fabric/core/componentdescriptor/ConcreteComponentDescriptor.h

@@ -81,6 +81,7 @@ private:
   ShadowNodeCloneFunction getCloneFunction() const {
     if (!cloneFunction_) {
       cloneFunction_ = [this](const SharedShadowNode &shadowNode, const SharedProps &props, const SharedShadowNodeSharedList &children) {
+        assert(std::dynamic_pointer_cast<const ShadowNodeT>(shadowNode));
         return this->cloneShadowNode(shadowNode, props, children);
       };
     }