Government figures due Friday will undoubtedly show that job losses in April were the worst ever. But they could provide key hints about the recovery. Economists surveyed by MarketWatch expect the report, which the Labor Department will release on Friday, to show that U.S. payrolls fell by 22 million jobs last month — a decade’s worth of job gains, wiped out in weeks. The payroll processing company ADP said on Wednesday that the private sector lost more than 20 million jobs in April, with the cuts spread across every sector and size of employer. To put that in perspective: In the worst month of the last recession, the U.S. lost 800,000 jobs.