WASHINGTON — A sharply divided U.S. Supreme Court on Tuesday allowed Texas to continue enforcing abortion restrictions that opponents say have led more than a third of the state’s clinics to stop providing abortions. The justices voted 5-4 to leave in effect a provision requiring doctors who perform abortions in clinics to have admitting privileges at a nearby hospital. The court’s conservative majority refused the plea of Planned Parenthood and several Texas abortion clinics to overturn a …