o.append(ir.NewIfStmt(base.Pos,
		ir.NewBinaryExpr(base.Pos, ir.OEQ, counter, ir.NewInt(base.Pos, 0xff)),
		[]ir.Node{ir.NewAssignStmt(base.Pos, counter, ir.NewInt(base.Pos, 1))},
		[]ir.Node{ir.NewAssignOpStmt(base.Pos, ir.OADD, counter, ir.NewInt(base.Pos, 1))}))
}

// orderBlock orders the block of statements in n into a new slice,
// and then replaces the old slice in n with the new slice.