[issue26219] implement per-opcode cache in ceval

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

"What's new in Python 3.8" says that this change speeds up the LOAD_GLOBAL opcode by 40%.
That seems meaningless as a program cannot have LOAD_GLOBAL in isolation so any test would have other bytecodes as well.

What's the evidence for the claimed speedup?
What's the speedup on the benchmark suite?

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nosy: +Mark.Shannon

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