Faster compilation speed

[Jamie Lokier]

David S. Miller wrote:
>       You can easily use much less than a full word.  Foundation on 
>    OpenStep/Mach 4.2 started storing partial ref counts in whatever spare 
>    bits were available in each object.
> 
> We don't have any spare bits, we have 32 bits used for RTX state then
> the next object is a pointer.  So whatever size counter we use will
> eat at a minimum a word's worth of space to get the pointers aligned
> up properly.

Did I see "pointers" and "aligned" there?

You have 2 spare bits per pointer, man, open your eyes! :-)

-- Jamie