[MLton] new version of MLton

[Henry Cejtin]

I just compiled the latest version of mlton/trunk and tested it compiling
the program
	val () = print "Hello world\n"
comparing it to the 20051202 version.
The old compiler took 7.74 CPU seconds to compile the above, but the new
one took 18.00 CPU seconds.  Also, the old executable is just under 78K
while the new one is over 108K.
Any notion on why these changes?