By Emily Bary Stock is one of the S&P 500's biggest losers this year Intel Corp.'s bad year is getting worse as the chip stock experiences another sharp slide in the wake of earnings. Shares of Intel (INTC) are down about 9% in Friday's midday trading after the company came up short with its revenue and margin outlooks for the current quarter. It's the second significant post-earnings selloff in as many quarters for Intel's stock. Intel is the third-worst performer in the S&P 500 SPX so far this...