Varray memory consumption strikes back

[Jan Hubicka]

> 
> Eh?  obstack_free is precisely a pop operation.

Well, for obstack_free you need to know the address of object you want
to pop off the stack, so it is not exactly what I need ;)
> 
> > This is stack implementation that don't use resizing and ggc.  I converted the
> > dom's stacks to it and it seems to be resonably fast.  On Gerald's testcase it
> > redues compilation time from 1m14.581s to 1m14.025s (consistently) and memory
> > footprint from 89MB to 80.
> > 
> > While measuring the bootstrap speed, the difference seems to be winthin noise.
> 
> You didn't include the new files.
Oops...
Attached.
Honza
> 
> -- 
> Daniel Jacobowitz
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