[issue3873] Unpickling is really slow

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Indeed. If I replace the file with 
    f = io.BytesIO(open("tst", "rb").read())
timings are divided by 20...

After quick profiling, it seems that PyLong_New would benefit from a
free list. len(bytearray) is called very often.
To stay simple, it would be enough to only store longs of length 1 (<2**15).

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue3873>
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