[issue26219] implement per-opcode cache in ceval

[Nick Coghlan]

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

With the 3.7 beta deadline just around the corner, 3.8 will be the next opportunity to reconsider this idea.

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versions: +Python 3.8 -Python 3.6

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<https://bugs.python.org/issue26219>
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