[issue23259] Remove dummy reuse optimization from sets

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

In some cases the slowdown is over 100x.

$ ./python -m timeit -s "s = set(range(10**4))" -- "s.discard(0); s.add(0)"

Unpatched: 1000000 loops, best of 3: 1.68 usec per loop
Patched: 10000 loops, best of 3: 183 usec per loop

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23259>
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