By Herbert Lash NEW YORK (Reuters) – U.S. and European stocks slid on Wednesday as the outlook for rate hikes sullied sentiment, while bond yields rose after euro-zone gross domestic product beat expectations, adding to bets of a more hawkish European Central Bank. Trading was choppy as investors awaited the ECB meeting on Thursday and U.S. consumer price data on Friday that will highlight the dilemma investors face as they juggle how much central banks tighten policy and its impact on inflation. The White House said it expected the headline inflation number on Friday to be “elevated.” Economi…