There are many specializations for LOAD_ATTR that make sense. LOAD_ATTR in 3.10 only handles two, so we should have an easy win here.

Possible specializations are:

• Attribute is in instance dictionary
• Attribute is in a slot
• Attribute is a non-descriptor attribute of the class
• Attribute is a property
• Attribute is method
• The owner is a module

We will want dictionary keys versioning for several of the above.