MGM Resorts International MGM.N jumped 6.9% after Credit Suisse upgraded the U.S. casino operator's stock to "outperform" from "neutral". By Devik Jain Oct 12 (Reuters) - U.S. stock indexes were trading largely flat in a choppy session on Tuesday on worries over the impact of rising inflation on upcoming third-quarter earnings, while Tesla gained after record China-made vehicles sales. Higher oil prices coupled with supply chain disruptions have set off alarm bells for businesses and consumers in the run-up to quarterly reports from companies, which will start with JPMorgan Chase & Co JPM.N on Wednesday.