[Bug c++/59300] visibility computation misses some attributes in namespaces

[rafael.espindola at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59300

--- Comment #1 from Rafael Avila de Espindola <rafael.espindola at gmail dot com> ---
clang had an even stranger behavior
(http://llvm.org/bugs/show_bug.cgi?id=18174). I fixed that in a way that it now
agrees with gcc on the testcase in this bug.

It would still be nice to know if the current behavior is intentional or not.