By Bret Kenwell GM stock faces two key levels on the chart: One as support and the other as resistance. The semiconductors are in constant discussion and for good reason. As it relates to General Motors (GM) – Get General Motors Company Report, the company cited semiconductor shortages in a recent profit and deliveries update. It wasn’t an earnings report, but the company updated investors on Friday morning by saying it expects second-quarter net income between $1.6 billion and $1.9 billion. Shares slipped slightly in the pre-market on the news, but it’s been a bit more volatile since the open…