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mandatory_only_cme
should not be in def
`def` (`rb_method_definition_t`) is shared by multiple callable method entries (cme, `rb_callable_method_entry_t`). There are two issues: * old -> young reference: `cme1->def->mandatory_only_cme = monly_cme` if `cme1` is young and `monly_cme` is young, there is no problem. Howevr, another old `cme2` can refer `def`, in this case, old `cme2` points young `monly_cme` and it violates gengc assumption. * cme can have different `defined_class` but `monly_cme` only has one `defined_class`. It does not make sense and `monly_cme` should be created for a cme (not `def`). To solve these issues, this patch allocates `monly_cme` per `cme`. `cme` does not have another room to store a pointer to the `monly_cme`, so this patch introduces `overloaded_cme_table`, which is weak key map `[cme] -> [monly_cme]`. `def::body::iseqptr::monly_cme` is deleted. The first issue is reported by Alan Wu.
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