Use Bohem's GC for compiler proper in 4.1?

[Robert Dewar]

Zack Weinberg wrote:

> Last year CodeSourcery had a contract to speed up the C++ front end at
> -O0, and we found that small linear reductions in memory usage
> corresponded directly to small linear reductions in time usage, at
> about a 2:1 ratio (so 1% less memory -> 0.5% less time).  That
> wouldn't be worth bothering with except that there are *lots* of
> places where such reductions are available.  We eventually got
> something like a 40% overall speedup just from this.  (Sorry, I
> haven't got exact numbers.)

Right I am aware of that work, but we are talking now, so the question
is do similar opportunities still exist?