[MLton] MLton on intel mac

[Matthew Fluet]

> I figured out what you told me today.  I've been able to compile and run 
> hello world, and I am compiling the full compiler right now.  I'll send an 
> update when I'm able to compile mlton with itself.

Excellent.

> The changes I made will also align all C calls on x86 to 16 byte bounds.  I 
> don't know enough about the frame layout within SML code to try this, but it 
> doesn't seem to be necessary.

It should be fairly easy to set things up to only do alignment to 16 byte 
boundaries on the MacOS.  I don't quite follow your comment regarding the 
frame layout within SML code.