BUG FOUND

[Henry Cejtin]

My guess is that GC costs could `easily' be cut in 2 by inlining forward.
Of course this probably means you have to have first-order versions of the
various foreach... guys.  Still, that isn't too bad.
(By the way, I really HATE the brace style in gc.c.  The body of a function
starts with `{' on a line by iteself, in column 1.)
Anyway, at best (assuming GC forwarding and friends -> 0), this would save
14.89%.  Not 0, but not a big deal.