[issue26219] implement per-opcode cache in ceval

[Yury Selivanov]

Yury Selivanov added the comment:

BTW, there are a couple of unit-tests that fail.  Both can be easily fixed.

To really move this thing forward, we need to profile the memory usage.  First, it would be interesting to see how much additional memory is consumed if we optimize every code object.  That will give us an idea of the overhead, and if it is significant, we can experiment with various heuristics to minimize it.

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