Lawyers looking to sue General Motors Co. after its global recall of 1.6 million vehicles over an ignition defect may find their path blocked by a judge’s order five years ago in the company’s reorganization. Allegations about deaths or economic losses occurring before July 2009 were barred by a bankruptcy judge when he approved the sale of the automaker’s assets to the new GM. Attorneys are now examining pre-bankruptcy deaths and claims with a view to getting the ban lifted.