[issue15535] Fix pickling efficiency of named tuples in 2.7.3

[Antoine Pitrou]

Antoine Pitrou added the comment:

I would like to call this a critical regression.
Under 2.7 and 3.2, all pickle protocols are affected.
Under 3.3 and 3.4, pickle protocols 0 and 1 are affected.

(unfortunately, 3.2 doesn't receive bugfixes anymore)

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nosy: +benjamin.peterson, pitrou
priority: high -> release blocker

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15535>
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