[issue26280] ceval: Optimize [] operation similarly to CPython 2.7

[Yury Selivanov]

Yury Selivanov added the comment:

Looks like we want to specialize it for lists, tuples, and dicts; as expected.  Not so sure about [-1, but I suggest to benchmark it anyways ;)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26280>
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