Stocks Dip as Oil Soars; Google Shines  NEW YORK (Reuters) - U.S. stocks slid on Thursday, ending  four days of gains as oil prices continued their march higher,  but Google Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GOOG.O target=/stocks/quickinfo/fullquote"&gt;GOOG.O&lt;/A&gt; created a buzz as shares of the  Internet search company surged on their debut.