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

[Zach Byrne]

Zach Byrne added the comment:

I'm attaching output from a selection of the benchmarks, I'm counting non-builtins and slices, but for everything, not just lists and tuples.

Quick observation: math workloads seem list heavy, text workloads seem dict heavy, and tuples are usually somewhere in the middle.

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Added file: http://bugs.python.org/file41826/subscr_stats.txt

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