[issue5683] Speed up cPickle's pickling generally

[Jerry Chen]

Jerry Chen <jerry at 3rdengine.com> added the comment:

Applied collinwinter's patch and svn up'd to r73872; replaced additional
instances of self->write_func with _Pickler_Write.

Passed test_xpickle.py as referenced by issue 5665.

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nosy: +jcsalterego
Added file: http://bugs.python.org/file14466/cpickle_writes-r73872.patch

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