“Whether, when applying the test for patent eligibility set forth in Mayo Collaborative Services v. Prometheus Laboratories, Inc., 566 U.S. 66 (2012), a patent claim should be considered ‘as a whole’ in accordance with Diamond v. Diehr, 450 U.S. 175 (1981), or instead, whether all conventional elements of the claim must be disregarded prior to determining its ‘point of novelty’ as set forth in this Court’s older precedent in Parker v. Flook, 437 U.S. 584 (1978).”