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39a333aa2b
look through a freelist for a chunk of adequate size. For a long time now, all elements of a given freelist have been exactly the same allocated size, so we don't need a loop. Since the loop never iterated more than once, you'd think this wouldn't matter much, but it makes a noticeable savings in a simple test --- perhaps because the compiler isn't optimizing on a mistaken assumption that the loop would repeat. AllocSetAlloc is called often enough that saving even a couple of instructions is worthwhile.