One of Warren Buffett’s favorite holdings, Occidental Petroleum (NYSE: OXY), just exhibited a “Death Cross” pattern on its stock chart following a period of significant volatility, potentially foreshadowing a further decline in price.Despite a weak performance year-to-date, Buffett has continued to increase his holding of OXY stock during this period, with gas and oil producers stock occupying a 4.86% position, which amounts to 255.3 million shares worth around $15 billion—nearly 30% of the company’s total ...