GLOBAL MARKETS-Asia shares bounce on trade talk, stimulus wagers

*Nikkei rises to 2019 high, China blue chips bounce. SYDNEY, Feb 18- Asian share markets bounced broadly on Monday as investors dared to hope for both progress at Sino-U.S. trade talks in Washington this week and more policy stimulus from major central banks. The Dow and the Nasdaq had boasted their eighth consecutive weekly gains on wagers the United States and...