[issue28158] Implement LOAD_GLOBAL opcode cache

[Yury Selivanov]

Yury Selivanov added the comment:

> Does this prolongate the lifetime of cached global objects?

No.  I store borrowed references.  The idea is that if the state of globals/builtins dict has changed, we invalidate the cache.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28158>
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