Tesla TSLA.Oshares surged while AT&T Inc T.N tumbled, sending telecom shares down after the wireless carrier cut its cash flow forecast saying some subscribers were delaying bill payments. By Echo Wang July 21 (Reuters) - U.S. stocks ended higher on Thursday as electric automaker Tesla rose on its stronger-than-expected quarterly results, which helped offset a slide in telecom and energy shares. Market participants continue to await anxiously for the U.S. Federal Reserve meeting next week where policymakers are expected to raise interest rates by 75 basis points to curb runaway inflation.