[issue5670] Speed up pickling of dicts in cPickle

[Collin Winter]

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

FYI, I just added a pickle_dict microbenchmark to perf.py. Using this
new microbenchmark, I see these results (perf.py -r -b pickle_dict):

pickle_dict:
Min: 2.092 -> 1.341: 56.04% faster
Avg: 2.126 -> 1.360: 56.37% faster
Significant (t=216.895643, a=0.95)

I still need to address the comment about pickling empty dicts.

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