[Bug 294719] lib/msun: Added fmaximum_mag_num

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D294719

--- Comment #1 from Jes=C3=BAs Cipriano Bl=C3=A1zquez Mart=C3=ADnez <jesusc=
[email protected]> ---
I have a question regarding the correctness of my implementation. Isn't it
possible that an optimization will turn:

return ((x + y) !=3D 0.0 ? y : y);

into=20

return y;

If that's the case, maybe it is better to do:

volatile double force_except =3D x + y;
(void)force_except;

--=20
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