zero extend pointer converstions to unsigned long long

[Mike Stump]

On Sep 24, 2004, at 1:19 PM, Richard Henderson wrote:
> You know, there might have been a reason that comment that you're 
> deleting
> mentioned POINTERS_EXTEND_UNSIGNED.  Perhaps you should look into it?

Ok, how about this version?  This uses unsigned where it makes sense, 
and doesn't change the behavior otherwise.  While I would have liked to 
have made ptr_extend machines work, I didn't see how to make that 
reasonably happen.  Further, I think it would require more serious 
testing than I can do, to ensure that those ports aren't broken by the 
change.

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