Moving the registers out of the context structure

[Dan Sugalski]

I give warning since it's likely to break a lot of stuff. I'll try 
and keep them in the same position in the interpreter structure, but 
this'll probably break the JIT. (I expect a rather large CVS diff by 
the time I'm done, though it may take a while...)

This'll probably get checked in tonight, given the amount of fiddly 
work it'll need.
--
                                        Dan

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Dan Sugalski                          even samurai
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