-native self compile problems

[Matthew Fluet]

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> I found and fixed the bug with voids.  It was a bug that I had just introduced
> with some changes that I made.  The native self compile I ran last night almost
> succeeded.  It failed during linking with
> 	undefined reference to `overflowCheckTemp'
> I guess this means I have a slightly out of date x86codegen.h.  Anyways, I added 
> the obvious fix for this problem and just started a new run.  Matthew, could you 
> send me your latest x86codegen.h so I can do a diff.  

Here's my version of x86codegen.h.  I actually didn't have
overflowCheckTemp in there, but I independently got that error just
recently.  It's due to a weird combination of copy propagation and
floating point.



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