[Bug c++/64431] "-Wignored-qualifiers" warning gives misleading position in code

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64431

--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Note that, besides the cases of volatile and restrict which should be also
included, already have a patch including those, we need further tweaks to
recover the location of 'const' in:

   int* const f9();