Register move is in and done

[Dan Sugalski]

And I fully expect to get a few monster commit messages when this is 
all done. Anyway, I've moved the registers out of the context struct, 
and to the front of the interpreter struct, which is where they were 
anyway, just indirectly. The non-JIT version compiles and builds just 
fine (including IMCC) but the JIT version does throw some errors. 
This isn't unexpected, unfortunately. (Sorry 'bout the extra work on 
the JIT, guys)

This should make taking continuations much faster, since there's no 
need to memcpy 640 (or, on 64 bit machines, 1K) of extra data for 
each continuation we take.
--
                                        Dan

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Dan Sugalski                          even samurai
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