By Bret Kenwell McDonald’s reports earnings Thursday morning, and the chart shows two main levels investors should know. In a busy week of earnings reports, McDonald’s (MCD) – Get McDonald’s Corporation Report is set to report for Q4 on Thursday before the open. At this week’s low, the Chicago burger giant’s shares were down 8.9% from the all-time high set on Jan. 4. That seems like a big move for what’s supposed to be a slow-moving stock. But when one considers that the Nasdaq and the S&P 500 were down 18.5% and 12.4% from their respective all-time highs, McDonald’s losses might not seem so b…