self compile polyvariance and inlining experiments

[Stephen Weeks]

Here are four different self compiled versions of MLton, compiled with
and without polyvariance and with two different inlining thresholds
(15 and 25).  

Here are the running times for compiling lexgen.

	-np	(polyv)
	------	-------
-i 15	136.35	104.78
-i 25	129.7	99.52

Here are the code sizes.

	-np	(polyv)
	-------	-------
-i 15	3417017	6062297
-i 25	3963693	6793181