bug#32463: 27.0.50; (logior -1) => 4611686018427387903

[Paul Eggert]

> > a) A bug in bignumcompare for 64bit Windows. Patch is here:
> > http://lists.gnu.org/archive/html/emacs-devel/2018-08/msg00487.html
> > ...
> > b) fmod_float has a bug:
> > http://lists.gnu.org/archive/html/emacs-devel/2018-08/msg00442.html
> >
> > c) Extend Fexpt to support bignums. Patch is here:
> > http://lists.gnu.org/archive/html/emacs-devel/2018-08/msg00503.html
> >
> > d) Extend Fceiling, Ffloor, Fround and Ftruncate to support bignums by
> >    updating rounding_driver.

I worked on these and installed patches to master that should do (a), (b), and 
(c). For (d) I wrote the attached patch, and plan to test it a bit more before 
installing, as it's the hairiest.

rounding.diff
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