GLOBAL MARKETS-U.S. stocks, bonds gain while dollar, oil fall

* China exports ease worry about sharp slowdown * Soft U.S. jobs data heightens speculation over Fed tapering * Olympic win boosts Tokyo stocks to 5-week high * Oil slips as U.S. tries to drum up support for Syrian strike By Ellen Freilich NEW YORK, Sept 9 (Reuters) - U.S. stocks and bonds rose on Monday while the dollar fell against most major currencies after a soft jobs report last week fed debate over when the U.S. Federal Reserve would begin to reduce its stimulative b