* elfcode.h (bfd_section_from_shdr): Don't dump core if target

	* elfcode.h (bfd_section_from_shdr): Don't dump core if target
	section has no ELF section data.
	(elf_make_sections): Set addralign of reloc section to 4.
	(elf_fake_sections): Likewise.
	(map_program_segments):	Don't consider section 0.
	(assign_file_positions_except_relocs): Don't consider section 0.
	In the main loop, skip the symtab and strtab sections, since their
	positions are set elsewhere.
	(swap_out_syms): Set addralign of symtab section to 4.  Set
	addralign of strtab sections to 1.
	(assign_file_positions_for_relocs): Don't consider section 0.
	(write_object_contents): Don't write out section 0.
	(sym_is_global): Take abfd argument.  Call
	elf_backend_sym_is_global if it is not NULL.
	(elf_map_symbols): Pass abfd to sym_is_global.
	(write_object_contents): Call elf_backend_final_write_processing
	if it is defined.