PR 33821 use after free commit e6357caf7579

PR 33821 use after free commit e6357caf7579

reset_resolved_wilds didn't clear out matching_sections in output
sections with constraint -1.  Fix that and tidy call sites of
obstack_init and obstack_free for matching_obstack so that the obstack
is allocated later and freed completely.  Also tidy ptroot.

	PR 33821
	* ldlang.c (the_root): Delete, replacing with..
	(ptroot): ..this, no longer a pointer.  Update all uses.
	(lang_for_each_statement_worker): Add "constrained" param.
	Ignore os.constraint if false.
	(reset_resolved_wilds): Use lang_for_each_statement_worker.
	Move obstack_init..
	(lang_init): ..and this obstack_init of matching_obstack..
	(resolve_wilds): ..to here.
	* ldlang.h (lang_for_each_statement_worker): Update declaration.
	(lang_for_each_statement): Update.
	* emultempl/xtensaelf.em: Update lang_for_each_statement_worker
	calls throughout.