(Refiles to insert dropped word “like” in quote, paragraph 4) By Stephen Culp NEW YORK (Reuters) -U.S. stocks ended in the red on Friday, falling to two-month lows as a warning of impending global slowdown from FedEx hastened investors’ flight to safety at the conclusion of a tumultuous week. All three major U.S. stock indexes slid to levels not touched since mid-July, with the S&P 500 closing below 3,900, a closely watched support level. Staggering past the finish line of a week rattled by inflation concerns, looming interest rate hikes and ominous economic warning signs, the S&P 500 and the …