// expression or simple statement.
// the types expressions are calculated.
// compile-time constants are evaluated.
// complex side effects like statements are appended to init.
func walkExprList(s []ir.Node, init *ir.Nodes) {
	for i := range s {
		s[i] = walkExpr(s[i], init)
	}
}

func walkExprListCheap(s []ir.Node, init *ir.Nodes) {
	for i, n := range s {
		s[i] = cheapExpr(n, init)

		}
		return stackTempAddr(init, t)
	}
	types.CalcSize(t)
	n.MarkNonNil()
	return n
}

func walkMinMax(n *ir.CallExpr, init *ir.Nodes) ir.Node {
	init.Append(ir.TakeInit(n)...)
	walkExprList(n.Args, init)
	return n
}

// generate code for print.
func walkPrint(nn *ir.CallExpr, init *ir.Nodes) ir.Node {
	// Hoist all the argument evaluation up before the lock.
	walkExprListCheap(nn.Args, init)