[Bug c++/65801] [5/6 Regression] Allow -Wno-narrowing to silence stricter C++11 narrowing rules

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65801

--- Comment #10 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I'm also attaching what I have for the forced pedantic-errors idea.