By Shreyashi Sanyal and Johann M Cherian (Reuters) -U.S. stock indexes were set to open lower on Tuesday as corporate reports from bellwethers including 3M, Johnson & Johnson and GE pushed earnings season into high gear, while chip companies retreated after bouncing in the previous session. In a week packed with high-profile earnings reports and key economic data, investors will now look to assess the impact of the Federal Reserve’s rate-hiking spree. The central bank is widely expected to raise rates by another quarter of a percentage point next week. Industrial conglomerate 3M Co fell 4.7%, …