addr_size.
(read_address): Replace 'bdf*' argument with 'comp_unit*' argument.
Use addr_size for address size, rather than sizeof(bfd_vma).
(read_attribute): Replace bdf* argument with 'comp_unit*' argument.
Fix call to read_address.
(decode_line_info): Replace bdf* argument with 'comp_unit*' argument.
Scrap other unneeded arguments. Fix call to read_address.
(scan_unit_for_functions): Fix call to read_attribute.
(parse_comp_unit): We now handle more values for addr_size.
Set addr_size in unit. Fix call to read_attribute and
decode_line_info.
