Symbol.hasInstance support in JSRT

[jasongin]

After updating the Node-ChakraCore JSRT implementation, addons_napi/test_instanceof fails because Symbol.hasInstance is not handled by either JsInstanceOf() or the JSRT napi_instanceof() implementation.

[mhdawson]

Closing since Chakra is no longer active, please let us know if you think that was not the right thing to do.