In general the non-engineers at tech companies get treated pretty well and I don't think they are more likely to get laid off than they are at other companies. They also generally get the same kind of RSUs/options/stock comp as anyone else at the company: those are not normally restricted to engineers, although engineers often get more compensation than others.

Marketing, advertising and sales people are especially vulnerable at any company: if the company expects consumer confidence and purchases to decline, those are some of the first roles that get cut anywhere.