Jim O’Heir is a Cinnabon fan — since his “Better Call Saul” guest-starring role required him to scarf down scads of the mega-sugary cinnamon rolls.“They brought in 100 fresh [Cinnabons] each day,” O’Heir told The Post. “One day, after one of the takes, I went to my little break area and a medic comes up and says, ‘Hi, Jim, I’m going to check to make sure your blood-sugar levels aren’t getting out of hand.’ I did end up eating a lot of them … it was so important to the storyline that the director [Michelle MacLaren] got on the phone with me before I flew to Albuquerque [to shoot the episode] to talk about it.