New codegen failing test-cases

[Edward Z. Yang]

I fired up the new codegen and ran make fast on the regression suite
and the following new tests started failing:

   3207(normal)
   4030(normal)
   cgrun016(normal)
   cgrun045(normal)
   cgrun051(normal)
   dsrun005(normal)
   dsrun007(normal)
   dsrun008(normal)
   exceptionsrun001(normal)
   exceptionsrun002(normal)
   ffi021(normal)
   simplrun010(optc)
   strun002(optc)

I plan on investigating them in further detail.

Cheers,
Edward