[issue3439] create a numbits() method for int and long types

[Mark Dickinson]

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

> Well, I don't think bit_length() warrants a specific test which will
> slow down the whole pybench suite.

Me neither.  It's a temporary patch to pybench, to establish whether it's 
worth applying optimizations to bit_length.  I didn't intend that it 
should be applied to the trunk.

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