Who on earth would swallow Credit Suisse at this point?
If anything, I’d bet they’ll be carved up into pieces - with you as a shareholder ending up owning (part of) the bad (i.e. worthless) parts of the company. Even if they’re going to be restructured or recapitalised in some other, you’ll be holding the bag.
Your best bet with that, IMO, is honestly that they’ll survive as a whole and independently - possibly by government bail-out.