fib and tak

[Stephen Weeks]

> If the new stuff makes function calls slightly cheaper (because of the less
> complicated parameter dance), try something like fib or tak.

	old	new
fib	10.29	10.65
tak	25.69	25.70

I don't completely understand, since in the old world, while these
programs consisted solely of intrachunk calls (which was good), they
still had to move the formals from registers to stack slots, which
shouldn't be any better than the new scheme.