Known bugs/issues in nativeGen, 000228 (JRS)
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-- absC -> stix translation for GET_TAG and in fact anything
   to do with the packed-halfword layout info itbl field is
   pretty dubious.  I think I have it fixed for big and little
   endian 32-bit, but it won't work at all on a 64 bit platform.

-- There may or may not be bugs in some of the x86 insn selector 
   code in MachCode.lhs.  I have checked all of it against the 
   Rules of the Game (+ Rules of the game for Amodes) recorded in 
   that file, but am not 100% convinced that it is all correct.
   I think most of it is, tho.

-- It won't compile on Solaris or Alphas because the insn selectors
   are not up-to-date.

-- NCG introduces a massive space leak; I think it generates all the
   assembly code before printing any of it out (a depressingly 
   familiar story ...).  Fixing this will await a working heap profiler.