Trying to work around a 16-bit x86 weirdness

[DJ Delorie]

> That sounds smart...  Maybe I can have my cake and eat it; I could
> always do it later.  Or I can hope that register allocation becomes
> *really* smart by the time myour port shapes up so it can use
> non-consecutive registers as pairs.  (Maybe it's done already??)

List the eight 8-bit registers first, in the right order, so that they
happen to make the register pairs gcc already wants.  List the 16-bit
registers after that.