This is slightly missing the point - if GM goes through a Chapter 11 bankruptcy they will not "stop making cars". Their stock will go to zero, they will default

This is slightly missing the point - if GM goes through a Chapter 11 bankruptcy they will not "stop making cars". Their stock will go to zero, they will default on most of their borrowed money, they will probably have to fire a lot of people, simplify their product line, and sell off some brands to other groups. But they will keep operating as a company.