GH-131798: Optimize cached class attributes and methods in the JIT #134403
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This handles
_LOAD_ATTR_CLASS,_LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES,_LOAD_ATTR_NONDESCRIPTOR_NO_DICT,_LOAD_ATTR_METHOD_WITH_VALUES,_LOAD_ATTR_METHOD_NO_DICT, and_LOAD_ATTR_METHOD_LAZY_DICT.Also: clean up a few things I ran into while working on this, and document our symbol lattice.