* mach-o-i386.c (text_section_names_xlat): New table.
(data_section_names_xlat): Likewise.
(import_section_names_xlat): Likewise.
(mach_o_i386_segsec_names_xlat): Likewise.
(bfd_mach_o_tgt_seg_table): Use new tables.
* mach-o-x86-64.c (bfd_mach_o_tgt_seg_table): Set NULL.
* mach-o.c (mach_o_section_name_xlat, mach_o_segment_name_xlat):
Move to mach-o.h as typedefs.
(text_section_names_xlat): Update for current GCC usage.
(data_section_names_xlat): Likewise.
(dwarf_section_names_xlat): Likewise.
(objc_section_names_xlat): New table.
(segsec_names_xlat): Add objc table.
(bfd_mach_o_normalize_section_name): Replace with...
(bfd_mach_o_section_data_for_mach_sect): New.
(bfd_mach_o_section_data_for_bfd_name): New.
(bfd_mach_o_section_data_for_bfd_name): Update to use additional data.
(bfd_mach_o_convert_section_name_to_mach_o): Likewise.
(bfd_mach_o_bfd_copy_private_section_data): Implement.
(bfd_mach_o_write_symtab): Write a zero-length string as the first entry
for compatibility with system tools.
(bfd_mach_o_build_commands): Update section alignment info.
(bfd_mach_o_new_section_hook): Use translation table data to define
default section flags, type, attributes and alignment, when available.
(bfd_mach_o_init_section_from_mach_o): Add TODO comment.
(bfd_mach_o_section_type_name): Add 'symbol_stubs'.
(bfd_mach_o_section_attribute_name): Add 'self_modifying_code'.
(bfd_mach_o_get_section_type_from_name): Change "not-found" return
value.
(bfd_mach_o_tgt_seg_table): Set default NULL.
* mach-o.h (bfd_mach_o_segment_command): Use define for name length.
(bfd_mach_o_backend_data): Move until after contents are defined.
(bfd_mach_o_normalize_section_name): Remove.
(bfd_mach_o_convert_section_name_to_bfd): Declare.
(mach_o_section_name_xlat): Declare.
(mach_o_segment_name_xlat): Declare.
(bfd_mach_o_section_data_for_mach_sect): Declare.
(bfd_mach_o_section_data_for_bfd_name): Declare.