[issue10889] Fix range slicing and indexing to handle lengths > sys.maxsize

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Oh, and to explain my negative comment from earlier: that was my reaction when I realised I also needed to write PyLong versions of _PyEval_SliceIndex and PySlice_GetIndicesEx to make range slicing with large integers work properly.

As it turned out, the end result wasn't as scary as I initially feared (while compute_slice_indices is quite long, most of that is just the verbosity of PyLong arithmetic).

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<http://bugs.python.org/issue10889>
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