EMERGING MARKETS-Brazil stocks hold near all-time highs; Argentina stocks fall

(Updates prices) By Bruno Federowski BRASILIA, Jan 19 (Reuters) - Brazilian stocks hovered near all-time highs on Friday as optimism over the country's economic prospects sustained demand for local assets, while hopes of a tie-up with Boeing Co boosted shares of Embraer SA . The benchmark Bovespa stock index rose 0.32 percent, hitting an intraday record of 81,429. The bourse was supported by blue chips such as lenders Banco Bradesco SA and Itaú Unibanco Holding SA. Emerging mark