Pinterest Inc PINS.N jumped 11.94% after Piper Sandler upgraded the social media platform's stock to "overweight" from "neutral." By Chuck Mikolajczak NEW YORK, Dec 13 (Reuters) - U.S. stocks advanced on Tuesday after a smaller-than-forecast climb in consumer prices buoyed optimism the Federal Reserve could soon dial back its aggressive path of interest rate hikes aimed at taming inflation. Still, equities had pared gains ahead of the Fed's policy statement on Wednesday, in which the central bank is widely expected to announce a 50 basis point rate hike.