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

[Mark Dickinson]

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

I'm fine with rotating 4 bits instead of 3, especially if the timings look 
good on 32-bit as well as 64-bit.

We should really benchmark dict lookups (and set membership tests) as well 
as dict creation.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5186>
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