* elfcode.h: Include bfdlink.h. Added several new functions to do

	* elfcode.h: Include bfdlink.h.  Added several new functions to do
	linking.
	(ELF_R_TYPE): Define.
	(bfd_add_to_strtab): Return unsigned long.  Change check for
	realloc failure.
	(elf_fake_sections): Check return value of bfd_add_to_strtab.
	(elf_compute_section_file_positions): Add link_info argument.
	Call elf_backend_begin_write_processing hook and prep_headers
	here.  Only call swap_out_syms if link_info is NULL.  Set up
	.shstrtab section here.  Pass dosyms argument to
	assign_file_positions_except_relocs.  Set output_has_begun flag.
	(assign_file_positions_for_symtab_and_strtabs): Add dosyms
	argument, and use it to control setting .symtab and .strtab file
	positions.
	(assign_file_positions_except_relocs): Add dosyms argument, and
	pass it on.
	(prep_headers): Check return value of bfd_add_to_strtab.
	(swap_out_syms): Likewise.  Also, don't set up .shstrtab here.
	(NAME(bfd_elf,write_object_contents)): Some calls moved into
	elf_compute_section_file_positions.
	(elf_set_section_contents): Likewise.
	(elf_slurp_symbol_table): SHN_LORESERV corrected to SHN_LORESERVE.
	* libelf.h: Include bfdlink.h.
	(struct elf_backend_data): Add fields collect,
	elf_add_symbol_hook, elf_backend_relocate_section.
	(struct bfd_elf_section_data): Add field rel_hashes.
	(struct elf_obj_tdata): Remove fields internal_syms and symbols.
	Add field sym_hashes.
	(obj_symbols, obj_internal_syms): Remove definitions.
	(elf_sym_hashes): Define.
	(struct elf_link_hash_entry): Define.
	(struct elf_link_hash_table): Define.
	(elf_link_hash_lookup): Define.
	(elf_link_hash_traverse): Define.
	(elf_hash_table): Define.
	(_bfd_elf_link_hash_table_create): Declare.
	(bfd_elf32_bfd_link_add_symbols): Declare.
	(bfd_elf32_bfd_final_link): Declare.
	(bfd_elf64_bfd_link_add_symbols): Declare.
	(bfd_elf64_bfd_final_link): Declare.
	* elf.c: Include bfdlink.h.
	(elf_link_hash_newfunc): New function.
	(_bfd_elf_link_hash_table_create): New function.
	* elf32-target.h (elf_backend_relocate_section): If not defined,
	define as 0 and use generic linker.  Otherwise, use ELF backend
	linker.
	(elf_backend_collect): If not defined, define as false.
	(elf_backend_add_symbol_hook): If not defined, define as 0.
	(elf32_bed): Initialize new fields.
	* elf64-target.h: Same changes as elf32-target.h.
	* elf32-i386.c: Include bfdlink.h.
	(elf_i386_relocate_section): New function.
	(elf_backend_relocate_section): Define.
	* elf32-sparc.c: Include bfdlink.h.
	(elf_info_to_howto): Change type of dst from Elf32_Internal_Rela
	to Elf_Internal_Rela (they're the same type anyhow).
	(elf_sparc_relocate_section): New function.
	(elf_backend_relocate_section): Define.
	* elf32-mips.c (elf_backend_collect): Define.