Fix seg-fault in the linker introduced by the previous delta.

Fix seg-fault in the linker introduced by the previous delta.

	PR ld/20636
	* elf-bfd.h (struct elf_backend_data): Delete
	elf_backend_count_output_relocs callback and add
	elf_backend_update_relocs.
	* elf32-arm.c (elf32_arm_count_output_relocs): Deleted.
	(emit_relocs): Deleted.
	(elf32_arm_emit_relocs): Deleted.
	(elf_backend_emit_relocs): Updated not to use the old functions.
	(elf32_arm_update_relocs): New function.
	(elf_backend_update_relocs): New define.
	* elflink.c (bfd_elf_final_link): Add additional_reloc_count to the
	relocation count. Call elf_backend_emit_relocs.
	(_bfd_elf_size_reloc_section): Do not call
	elf_backend_count_output_relocs.
	* elfxx-target.h (elf_backend_count_output_relocs): Deleted.
	(elf_backend_update_relocs): New define.