[patch] Move common macros to i386-common.h

[Mark Kettenis]

>  Some macros are duplicated in gdb/i386-nat and gdb/gdbserver/i386-low.
>  This patch is to move common macros to gdb/common/i386-common.h.
>
>  There are also some duplicated functions, which should be moved in next
>  step.

I'm just back from a 3+-week holiday.  I'm not buying into the "share more
stuff between gdb and gdbserver" mantra yet.  Please hold off on this
until
I've gotten caught up with my mail and had a chance to think about all this.

Thanks,

Mark