[Bug middle-end/92463] Cleanups due to minimum MPFR version bump to 3.1.0

[jb at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92463

Janne Blomqvist <jb at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|fortran                     |middle-end

--- Comment #4 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Fortran parts done, reassigning to middle-end as there are similar MPFR
modernization opportunities there.