The SF Giants will place outfielder Mitch Haniger on the IL after he suffered a fracture in Tuesday night’s win over the St. Louis Cardinals, 11-3. Haniger was facing Jack Flaherty in the third inning when he was hit with an 88 mph changeup on the arm. The outfielder, who’d only returned to the active roster late April after suffering an oblique strain in spring training, was just coming back to form. He was the most expensive signing the Giants made this offseason, coming in at three years for $43.5M. In his 40 games this season, he was hitting a…