2016-09-28 Richard Biener <rguenther@suse.de>

2016-09-28  Richard Biener  <rguenther@suse.de>

	* dwarf2out.c (struct die_struct): Add removed flag.
	(lookup_type_die): If the DIE is marked as removed, clear
	TYPE_SYMTAB_DIE and return NULL.
	(lookup_decl_die): If the DIE is marked as removed, remove it
	from the hash and return NULL.
	(mark_removed): New helper.
	(prune_unused_types_prune): Call it for removed DIEs.
	(gen_subprogram_die): Move the premark_used_types call to after
	DIEs for the functions scopes are generated.
	(process_scope_var): Do not re-create pruned types or type decls.
	Make sure to also re-parent type decls.
	(dwarf2out_finish): Move unused type pruning and debug_types
	handling ...
	(dwarf2out_early_finish): ... here.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@240578 138bc75d-0d04-0410-961f-82ee72b054a4