PR ld/12365

	PR ld/12365
	PR ld/12672
bfd/
	* bfd.c (BFD_PLUGIN): Define.
	(BFD_FLAGS_SAVED, BFD_FLAGS_FOR_BFD_USE_MASK): Add BFD_PLUGIN.
	* bfd-in2.h: Regenerate.
	* elflink.c (elf_link_output_extsym): Strip undefined plugin syms.
	* opncls.c (bfd_make_readable): Don't lose original bfd flags.
ld/
	* ldfile.c (ldfile_try_open_bfd): Don't attempt any plugin action
	when no_more_claiming.
	* ldmain.c (add_archive_element): Likewise.
	(multiple_definition): Remove plugin_multiple_definition call.
	(notice): Remove plugin_notice call.
	* ldlang.c (lang_list_insert_after, void lang_list_remove_tail): Move.
	Delete prototype.
	(plugin_insert): New static var.
	(open_input_bfds): Only rescan libs after plugin insert point.
	(lang_gc_sections): Omit plugin claimed files.
	(lang_process): Set plugin_insert.  Only rescan when plugin adds
	objects.
	* plugin.h (no_more_claiming): Declare.
	(plugin_notice, plugin_multiple_definition): Don't declare.
	* plugin.c: Formatting.
	(orig_notice_all, orig_allow_multiple_defs, orig_callbacks,
	plugin_callbacks): New static vars.
	(no_more_claiming): Make global.
	(plugin_cached_allow_multiple_defs): Delete.
	(plugin_get_ir_dummy_bfd): Set SEC_EXCLUDE on dummy .text section,
	use newer bfd_make_section variant.  Make COMMON section too.
	Error handling.  Correct setting of gp size.
	(asymbol_from_plugin_symbol): Properly cast last arg of concat.
	(message): Likewise for ACONCAT.
	(asymbol_from_plugin_symbol): Use our COMMON section.
	(get_symbols): When report_plugin_symbols, show visibility too.
	(init_non_ironly_hash): Move.  Don't test non_ironly_hash.
	(plugin_load_plugins): Save state of linker callbacks, set up to
	call plugin_notice instead.  Call init_non_ironly_hash here.
	(plugin_call_all_symbols_read): Set plugin_multiple_definition in
	plugin callbacks.
	(plugin_notice): Rewrite.
	(plugin_multiple_definition): Make static, call original callback.
ld/testsuite/
	* ld-plugin/plugin-7.d: Adjust for plugin changes.
	* ld-plugin/plugin-8.d: Likewise.
	* ld-plugin/plugin.exp: Pass --verbose=2 for visibility test, and
	compare ld output to..
	* ld-plugin/plugin-12.d: New.