The patch adds a free list of long objects with size 1 or -1. It has
quite a tremendous effect on code like list(range(1000)).

$ ./python -m timeit "for i in range(100): list(range(1000))"

Without patch:
10 loops, best of 3: 79 msec per loop

With patch:
10 loops, best of 3: 20.8 msec per loop