[ruby-core:91649] [Ruby trunk Bug#15629] super_method fails on binded/unbinded/cloned methods

Issue #15629 has been reported by wanabe (_ wanabe).

----------------------------------------
Bug #15629: super_method fails on binded/unbinded/cloned methods
https://bugs.ruby-lang.org/issues/15629

* Author: wanabe (_ wanabe)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
derived from #13973:

```
module A
  def foo
  end
end

module B
  def foo
  end
end

class C
  include A
  include B
end

c = C.new
m1 = c.method(:foo)
p m1.super_method         # => #<Method: A#foo>
p m1.clone.super_method   # => nil
p m1.unbind.super_method  # => nil

m2 = C.instance_method(:foo)
p m2.super_method         # => #<UnboundMethod: A#foo>
p m2.clone.super_method   # => nil
p m2.bind(c).super_method # => nil
```

`super_method` of binded/unbinded/cloned method should be `super_method` of original method, shouldn't it?



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