[issue1540617] Use Py_ssize_t for rangeobject members

[Raymond Hettinger]

Raymond Hettinger added the comment:

FWIW, the current Py2.6 code for enumerate() and itertools.count() both
show how to support arbitrary longs without killing the performance of
common cases.

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nosy: +rhettinger

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<http://bugs.python.org/issue1540617>
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