Japan’s economy shrank at an annualized pace of 1.6 percent in April-June as exports slumped and consumers cut back on spending, a bad omen for Prime Minister Shinzo Abe’s policy drive to lift the economy out of decades of deflation. The gloomy data adds to signs that Japan’s economy is at a standstill and may rekindle market expectations that the Bank of Japan will expand monetary stimulus later this year.