bpo-44337: Port LOAD_ATTR to PEP 659 adaptive interpreter

[markshannon]

Implements four specializations of LOAD_ATTR:

• LOAD_ATTR_SLOT for slots.
• LOAD_ATTR_SPLIT_KEYS for attributes in instance dictionaries that have split keys.
• LOAD_ATTR_HINT for attributes in instance dictionaries that do not have split keys.
• LOAD_ATTR_MODULE for module attributes

There are more specializations of LOAD_ATTR that we want to implement, but this PR is large enough already.

https://bugs.python.org/issue44337

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[bedevere-bot]

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[pablogsal]

@markshannon You may want to check out https://bugs.python.org/msg395432 . This shows that the ASAN failures are not false positives as there is obviously something corrupted and we are reading that memory.

[markshannon]

Hopefully #26626 will fix the address sanitizer failures

[bedevere-bot]

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[cfbolz]

Just casually reading through some of the code, it looks like the STAT_INC(loadattr_hit); is duplicated here (see two lines up).

[markshannon]

Thanks Carl. #26718