.LOCAL_PROCEDURE_DESCRIPTOR defines a bivalued local identifier
    that is used to represent a local routine. The first value
    is the procedure value, which is the address of the procedure
    descriptor. This value is defined as the current location counter
    at the point where you use the .LOCAL_PROCEDURE_DESCRIPTOR
    directive. The second value is the code address, which is
    the code entry-point address of the procedure. This value is
    defined by the second argument to the .LOCAL_PROCEDURE_DESCRIPTOR
    directive. No storage is allocated.