By Noel Randewich and Ankika Biswas (Reuters) -The S&P 500 climbed to a record high close on Tuesday as investors digested a mixed bag of early quarterly results and awaited a slew of additional reports from Netflix, Tesla and other companies later this week. It was the third straight all-time high for the benchmark stock index, and many investors view upcoming quarterly reports from the heavily weighted “Magnificent 7” group of megacap companies as key to whether Wall Street’s recent rally continues or loses steam. “It’s a crescendo of reports tomorrow and Thursday, and then next week will be…