Known bugs in nativeGen, 000124 (JRS)
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All these bugs are for x86; I don't know about sparc/alpha.

-- argument marshalling for ccall is fundamentally flawed, since
   it moves the C stack pointer %esp as it pushes each argument.
   Alas, the register allocator spills relative to %esp and 
   assumes that it doesn't move.  Result: if the marshalling code
   for a ccall involves any spills, the resulting code will 
   probably be wrong.

   The Right Way to fix this is to copy stuff onto the stack
   without moving %esp, then adjust it immediately prior to the
   call insn and un-adjust it immediately following it.

-- nofib/spectral/cvh_unboxing exposes some kind of spilling bug
   (I think), since there are many references to registers %M229
   etc, which I believe are dynamic registers which didn't get assigned
   to real ones.