other files needed for native backend

Fri, 13 Oct 2000 22:23:57 -0400 (EDT)

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Here's x86codegen.h.  There are a couple of new things in here (a few
static memory locations for temporaries) and also some inline assembly to
do the initial jump to the main label.  That's a little nicer than the
quick little trampoline that was in the old version.

> 
> Matthew, 
> 
> Do I also need a new version of x86-codegen.h?
> 
> Did you change any other runtime files?
> 

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