By Herbert Lash NEW YORK (Reuters) – European stocks slid and U.S. shares wavered 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. Investors are worried about the economic outlook and its effect on results. Citi Re…