[cairo] 128-bit arithmetic

[Keith Packard]

I've finished the basic binary operators (+,-,*,/,%,<<,>>) for 64 and 128 
bit unsigned numbers; I suspect we'll need signed versions of at least 
some of these operations.  I'll see if I can't manage that in a while.

Please let me know what other operations are needed; almost any thing is 
easy now that we've got a well debugged division function.

I borrowed the algorithm from GCC (but not the code, of course).

-keith


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