[Bug debug/65549] [4.9/5/6 Regression] crash in htab_hash_string with -flto -g

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65549

--- Comment #28 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the context I put the stub DIE in is technically wrong.  Thus some more
analysis results.  The reason why we end up populating the limbo_die_list
from the force_decl_die path is because we refuse to put the context
(the __lambda2 type) into its context (the main function which we forced
a DIE for) because of

      /* A declaration DIE doesn't count; nested types need to go in the
         specification.  */
      if (context_die && is_declaration_die (context_die))
        context_die = NULL;