[ruby-core:122296] [Ruby Bug#21374] FrozenError message is inconsistent when a singleton method is defined on a frozen object

Issue #21374 has been reported by andrykonchin (Andrew Konchin).

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Bug #21374: FrozenError message is inconsistent when a singleton method is defined on a frozen object
https://bugs.ruby-lang.org/issues/21374

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
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I would expect a message to contain an object class (e.g. `can't modify frozen <class>: <object#inspect>`) when an ordinary frozen object (non a module or class) is being modified. It works this way in the following example:

```ruby
object = []; object.freeze; object.instance_variable_set(:@a, 42)
# (irb):5:in `instance_variable_set': can't modify frozen Array: [] (FrozenError)
```

But it doesn't in the following example:

```ruby
object = []; object.freeze; def object.x; end
# (irb):4:in `<main>': can't modify frozen object: [] (FrozenError)
```



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