Unadjusted basis; property transmitted at death

If the property was acquired by bequest, devise, or inheritance, the basis shall be fair market value of such property at the time of such acquisition. In the case of property transferred in trust to pay the income for life to or upon the order or direction of the grantor, with right reserved to the grantor at all times prior to his death to revoke the trust, the basis of such property in the hands of the persons entitled under the terms of the trust instrument to the property after the grantor's death shall, after such death, be the same as if the instrument had been a will executed on the day of the grantor's death. For the purpose of this Section property passing without full and adequate consideration under a general power of appointment exercised by will shall be deemed to be property passing from the individual exercising such power by bequest or devise.