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When duping Struct accessor methods, ensure they actually dup.
Partial fix for #3834 The main issue here is that we frequently return this for DynamicMethod#dup, rather than return a new instance, and then this gets modified by code expecting it to be something different. This breaks reflective code because many reflective methods will expect the methods in a module's method table to say their implementationClass is that module. The case in #3834 broke because the accessor methods in Struct have this "fake" dup logic, so when the struct class itself was duplicated, the methods got modified implementationClass = clone and seemed to "disappear" from the original. This is only a partial fix because it just fixes those accessors in Struct. The proper fix would be to make sure DynamicMethod#dup returns a real new object for all DynamicMethod (except "dead" ones like UndefinedMethod). This may also fix (or make easier to fix) issues like #2988, where a dup'ed module's methods do not reflect their new implementationClass. Specs pending.
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