[Bug c++/125644] narrowing warnings emitted twice

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125644

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 64655
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64655&action=edit
C++11 testcase