* elfxx-ia64.c (is_unwind_section_name): Consider linkonce unwind

	* elfxx-ia64.c (is_unwind_section_name): Consider linkonce unwind
	sections as well.
	(elfNN_ia64_final_write_processing): Map .gnu.linkonce.ia64unw.FOO
	to .gnu.linkonce.t.FOO text section.

	* readelf.c (process_unwind): Print all unwind sections, not just
	one.

	* config/tc-ia64.c (special_linkonce_name): New.
	(make_unw_section): Map .gnu.linkonce.t.FOO text section into
	.gnu.linkonce.ia64unw{,i}.FOO.
	(ia64_elf_section_type): Handle .gnu.linkonce.ia64unw{,i}.FOO.
	(dot_endp): Add comment about it.

	* elf/ia64.h (ELF_STRING_ia64_unwind_once): Define.
	(ELF_STRING_ia64_unwind_info_once): Define.

	* emulparams/elf64_ia64.sh (OTHER_READONLY_SECTIONS): Put
	.gnu.linkonce.ia64unw{,i} sections into corresponding .IA_64.unwind*
	output sections.
	* emulparams/elf64_aix.sh (OTHER_READONLY_SECTIONS): Likewise.