[Bug bootstrap/51572] [4.7 Regression] LTO bootstrap failed with bootstrap-profiled

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51572

--- Comment #7 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-12-16 13:16:19 UTC ---
At least the ICE we hit for the limbo node:

              if (DECL_P (node->created_for))
                context = DECL_CONTEXT (node->created_for);
              else if (TYPE_P (node->created_for))
                context = TYPE_CONTEXT (node->created_for);

              gcc_assert (context
                          && (TREE_CODE (context) == FUNCTION_DECL
                              || TREE_CODE (context) == NAMESPACE_DECL));

              origin = lookup_decl_die (context);
              if (origin)
                add_child_die (origin, die);
              else
                add_child_die (comp_unit_die (), die);

is odd, as the fallback for a non-existant context DIE is to attach the
DIE to the comp-unit-die.  So why not allow a comp-unit-die context
in the first place?  Thus, allow SCOPE_FILE_SCOPE_P limbo DIEs?