[issue5186] Reduce hash collisions for objects with no __hash__ method

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I observe even greater speedups (15%/20%/37%) on set creation. Here is
the updated benchmark script.

Added file: http://bugs.python.org/file12981/time_object_hash.py

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<http://bugs.python.org/issue5186>
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