Every code county has power under this subtitle to borrow money for any proper public purpose and to evidence the borrowing by the issue and sale of its general obligation bonds in the manner herein prescribed. Notwithstanding the other provisions of this subtitle, a code county also may issue bonds for sanitary facilities under the Environment Article and to issue such bonds as may be authorized by local law existing on the date this county acquires code home rule status; but in exercising the power to issue bonds described in this sentence, it shall not be necessary to enact a local law as provided in this subtitle; it shall only be required that the code county comply with the procedure set forth in the law conferring the borrowing power to be exercised.