inlining forward in gc

[Stephen Weeks]

> Yes, but if you just did inlining by declaring forward to be inline, that
> won't do it because of the fact that foreachPointerInHeap etc. use forward
> in a non-first-order way.

Sorry.  I made a special copy of foreachPointerInHeap with forward
built in, and I made forward inline.  I think that the profile
confirms that I did the right thing, since neither of these appear
(well, foreachPointerInHeap appears because of the initial load world, 
but that's unrelated).