error.c: Update the message format for NoMethodError

* If the receiver is a Class, use "... for class <class name>".
* If the receiver is a Module, use "... for module <module name>".
* If the receiver is an extended object (i.e., has a singleton class),
  use "... for <rb_any_to_s(receiver)>".
* Otherwise, use "... for an instance of <class name>".

Examples:

```
42.time    #=> undefined method `time' for an instance of Integer (NoMethodError)

class Foo
  privatee #=> undefined local variable or method 'privatee' for class Foo (NoMethodError)
end

def (o=Object.new).foo
end
o.bar      #=> undefined method `bar' for #<Object: 0xdeadbeef(any_to_s)> (NoMethodError)
```

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