func (s *state) intrinsicCall(n *ir.CallExpr) *ssa.Value {
	v := findIntrinsic(n.Fun.Sym())(s, n, s.intrinsicArgs(n))
	if ssa.IntrinsicsDebug > 0 {
		x := v
		if x == nil {
			x = s.mem()
		}
		if x.Op == ssa.OpSelect0 || x.Op == ssa.OpSelect1 {
			x = x.Args[0]
		}