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

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> At four bits, you may be throwing away information and I don't think
> that's cool.

The current patch *does* do a rotation:  it doesn't throw away any 
information.

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