[MLton] x86_64 branch runtime compiles on HPPA/HP-UX

[Matthew Fluet]

>> I do get some warnings still, which I don't think can be cured in
>> hpux.h.  We've seen these before, though:
>> 
>> bytecode/interpret.c: In function 'interpret':
>> bytecode/interpret.c:416: warning: cast increases required alignment of target type
>> basis/Real/modf.c: In function 'Real64_modf':
>> basis/Real/modf.c:10: warning: cast increases required alignment of target type
>
> Yup, these all seem to be the same that Stephen saw on sparc-solaris; the 
> bytecode/interpret.c:416 warning is "new", but it is due to the inlining of 
> Real64_modf into the bytecode interpreter, so it is effectively the same.

Sorry, that's not true.  Real64_modf wasn't inlined into the bytecode 
interpreter.  The warning in bytecode/interpret.c must be due to some 
other cast; I'd guess that the offending line is 128 of interpret.c, 
except that the macros pulled in from c-chunk.h also do a lot of casts, so 
I'm very surprised that there aren't more warnings.