[squirrelfish] a patch to slow down jsc

Hello list! I was poking about the parser recently and thought I could clean up some of the shenanigans there. I came up with the attached patch, which seems to slow down sunspider by about half a percent. My question is, why is this? It would seem to be easier on the allocator to make one object than two. Is WTF_MAKE_FAST_ALLOCATED really so powerful that it's worth splitting objects into multiple pieces? Just wondering :) Cheers, Andy