hash bfd sections for fast lookup and create.

hash bfd sections for fast lookup and create.
bfd/ChangeLog
	* bfd.c (struct _bfd): Add section_htab, section_tail.
	* libbfd-in.h (_bfd_delete_bfd): Declare.
	(bfd_section_hash_newfunc): Declare.
	* opncls.c (_bfd_new_bfd): Free memory on failure.  Init
	section_htab and section_tail.
	(_bfd_delete_bfd): New function.
	(bfd_openr): Use it.
	(bfd_fdopenr): Likewise.
	(bfd_openstreamr): Likewise.
	(bfd_openw): Likewise.
	(bfd_close): Likewise.
	(bfd_close_all_done): Likewise.
	(bfd_release): Comment.
	* section.c (struct section_hash_entry): New.
	(bfd_section_hash_newfunc): New function.
	(section_hash_lookup): Define.
	(bfd_section_init): New function, split out from
	bfd_make_section_anyway.
	(bfd_get_section_by_name): Lookup via hash table.
	(bfd_get_unique_section_name): Likewise.
	(bfd_make_section_old_way): Rewrite to use hash table.
	(bfd_make_section_anyway): Likewise.
	(bfd_make_section): Likewise.  Return NULL for attempts to make
	BFD_{ABS,COM,UND,IND}_SECTION_NAME.
	(_bfd_strip_section_from_output): Adjust section_tail if needed.
	* configure.in: Bump bfd version.
	* configure: Regenerate.
	* libbfd.h: Regenerate.
	* bfd-in2.h: Regenerate.

ld/ChangeLog
	* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Adjust
	section_tail when fiddling with section list.
	(gld${EMULATION_NAME}_list_options): Ensure sentences aren't
	broken into separate strings to make translation easier.
	* emultempl/mmo.em (mmo_place_orphan): Adjust section_tail when
	fiddling with section list.
	* emultempl/pe.em (gld_${EMULATION_NAME}_place_orphan): Likewise.