[Bug preprocessor/59782] libcpp does not avoid bug #48326 when compiled by older GCC

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59782

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Isn't it better to disable this code when not optimizing so that stage 1 is
never miscompiled?