Throw JSINativeException from asHostObject

Summary:
`asHostObject` should throw a `JSINativeException` like the other `as*`
functions. This should be a safe change to make in most cases, since
this function already did not work when JSI was being provided by a
dynamic library. However, I defer to mhorowitz.

Changelog: [Fixed] Throw JSINativeException from asHostObject

Reviewed By: jpporto

Differential Revision: D36873355

fbshipit-source-id: 589ac50ebb4ecec4bacfd923d8b0795c0a6c0e34

Author: neildhar

ReactCommon/jsi/jsi/jsi-inl.h

@@ -189,8 +189,8 @@ inline std::shared_ptr<T> Object::getHostObject(Runtime& runtime) const {
 template <typename T>
 inline std::shared_ptr<T> Object::asHostObject(Runtime& runtime) const {
   if (!isHostObject<T>(runtime)) {
-    detail::throwOrDie<JSError>(
-        runtime, "Object is not a HostObject of desired type");
+    detail::throwOrDie<JSINativeException>(
+        "Object is not a HostObject of desired type");
   }
   return std::static_pointer_cast<T>(runtime.getHostObject(*this));
 }