EMERGING MARKETS-Brazil stocks hold near all-time highs; Embraer jumps

By Bruno Federowski BRASILIA, Jan 19 (Reuters) - Brazilian stocks hovered near all-time highs on Friday as optimism over the nation'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 0.2 percent, supported by blue chips such as Vale SA and lenders Banco Bradesco SA and Itaú Unibanco Holding SA . Emerging markets kicked off the year with a rally as several reports show