Mookie Betts, Will Smith and Gavin Lux homered, Shohei Ohtani delivered a clutch single, and the Los Angeles Dodgers’ bullpen came up big in a do-or-die 8-0 win over the San Diego Padres in Game 4 of their National League Division Series on Wednesday. Facing elimination with no regular starters available, Los Angeles manager Dave Roberts went for a bullpen game and was rewarded as eight pitchers combined to blank the Padres on seven hits and knot the best-of-five series 2-2. Betts put the Dodgers on the board with his second home run of the postseason in the opening frame at Petco Park, launch…