No. Its not neccessary at all. First, because packet capturing/modifying requires administrator rights. But second, with administrator rights, you are aswell able to modify other processes that you don't own, thus can modify/read the RAM for the client or server before the data is encrypted by the SSL layer, or after its decrypted by the SSL layer.
Thus SSL will neither contribute or compromise anything security-wise, it will have zero effect. It may have effect on performance.
Also, since the private key for the certificate needs to be stored on the very same machine, the attacker could steal that key and use it to read/modify the local traffic.
So SSL will just only make debugging harder and add nothing.