[issue5671] Speed up pickling of lists in cPickle

[Collin Winter]

Collin Winter <collinw at gmail.com> added the comment:

I've added a microbenchmark to perf.py called pickle_list. Running that
on this change (perf.py -r -b pickle_list):

pickle_list:
Min: 1.126 -> 0.888: 26.86% faster
Avg: 1.154 -> 0.906: 27.43% faster
Significant (t=115.404547, a=0.95)

That's probably the upper bound on the performance improvement to be
realized from this patch.

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