AUGUSTA, Ga.—With Rory McIlroy holding a historic lead before the third round of the Masters, Shane Lowry needed a pair of miracles to work his way into contention. McIlroy, the player torching the field, would first have to run suddenly cold, and then Lowry would need some magic of his own.  McIlroy held up his end of the bargain with an out-of-nowhere fit of struggles that erased his advantage. But the moment galleries here will remember came when Lowry gripped his club at the sixth tee. That’s when Lowry became the first player in history to record a hole-in-one at…