new TextIO

[Stephen Weeks]

> Is TextIO still in flux?  (There was a check-in on Aug. 1.)  I.e., should
> I investigate the slow down in input1 under the new codegen?  I am
> investigating the slow down with stack slots in scanStream.
> 
>                20010725  new w/o stack  new w/ stack
> wc-input1           2.9            3.7           3.7
> wc-scanStream       5.2            3.6           4.6

I don't think input1 changed.  So, if you don't see the slowdown with the new
MLton (but without your stack stuff), it's probably due to your stuff.  Anyways,
I don't know of any bugs in TextIO and there are no changes on the todo list.