[issue42115] Caching infrastructure for the evaluation loop: specialised opcodes

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

> This idea can be implemented without opcode cache. I will try it.

I'd actually encourage trying to use the opcode cache because this way the optimization will be more generic. E.g. `decimal + decimal` would also be specialized via the cache, because you'd cache a pointer to the specific `+` operator implementation. I'm really not sure that adding specialized byte code is a good idea.

> * PHP uses scalar type for float and int

While at it, maybe we push the number of bits per int digit to 60?

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<https://bugs.python.org/issue42115>
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