A new wave of layoffs is washing over the U.S. as several big companies reassess staffing plans and settle in for a long period of uncertainty. MGM Resorts International and Stanley Black & Decker Inc. recently told some employees furloughed at the outset of the coronavirus pandemic that they wouldn’t be put back on the payroll. And companies bringing back the majority of furloughed workers, including Yelp Inc. and Cheesecake Factory Inc., are making reductions as they adjust to the new reality that many coronavirus-related…