[issue5670] Speed up pickling of dicts in cPickle

[Amaury Forgeot d'Arc]

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

Sorry, I was wrong. I think I noticed that the case size==1 was handled 
differently, and incorrectly inferred the same for size==0.
(btw, the patch for trunk was not updated)

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