Possible explaination why large_real_kind_form_io_2.f90 is failing on PPC/OSX

[Andrew Pinski]

> 
> Trying to understand why large_real_kind_form_io_2.f90 is failing on PPC/OSX,
> I ended up with the following code:
> 
> ! { dg-do run }
> ! { dg-require-effective-target fortran_large_real }
> ! PR libfortran/24685
The real reason: darwin fucked uphow to call the 128bit long double math functions.

-- Pinski