Market Watch   U.S. stocks rallied Wednesday, with the Dow industrials jumping 257 points, led by a surge in financial, health-care and industrial stocks, as investors bet on the infrastructure spending policy promised by President-elect Donald Trump.The Dow Jones Industrial Average DJIA, +1.40% gained as much as 316 points, briefly surpassing the all-time closing high set in August. The index closed 256.95 points, or 1.4%, higher at 18,589.69, its highest level since Aug. 18. Pfizer Inc. PFE, +7.07% and Caterpillar Inc CAT, +7.70% led the gains, rallying more than 7%.