[Bug c++/64500] push_to_top_level() shows up high during build of modern C++ code

[ak at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64500

--- Comment #11 from ak at gcc dot gnu.org ---
Okay it's not aliases just all the decls of the scope.

I think it would benefit from two lists, one list of marked decls, and another
of yet to mark decls. So that the already marked bindings don't need to be
re-walked.