By Chuck Mikolajczak NEW YORK (Reuters) – U.S. stocks rallied on Tuesday and the S&P 500 ended a 3-day skid as another drop in oil prices and a softer-than-expected reading on producer prices helped ease inflation fears among investors, with the focus turning to the Federal Reserve’s upcoming policy announcement. Brent crude settled below $100 a barrel after rocketing higher to more than $139 last week, providing some temporary relief for equity investors that have seen stocks come under pressure this year from surging inflation concerns, uncertainty over the Fed’s policy path to tame rising p…