all oops situations should probably dump control regs

presently we dump a bunch of registers in fault oopses, but we don't print any in panics. of course, printing `rsp`/`rip` and normal registers in a panic is less interesting because the panic pushes a stack frame. but, we could still print control registers, which probably aren't munged by the panic machinery. it would be nice to have `cr0`, `cr3` and some other shit probably.