[Bug debug/78835] [7 regression] ICE with -fdebug-types-section and member function

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78835

--- Comment #3 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
started failing with:
r240578 | rguenth | 2016-09-28 07:30:19 -0700 (Wed, 28 Sep 2016) | 17 lines

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.