EMERGING MARKETS-Brazil stocks rise on ECB rates outlook, US data

* ECB signals it intends to keep monetary policy loose * US consumer confidence highest in almost six years * Brazil Bovespa gains 0.43 pct, Mexico IPC adds 0.48 pct By Asher Levine and Danielle Assalve SAO PAULO, May 17 (Reuters) - Brazilian stocks rose on Friday after a pledge from the European Central Bank to support economic growth through loose monetary policy boosted shares of commodities exporters. Mexico's IPC index erased the previous session's losses, while Chile's