[ruby-core:105294] [Ruby master Bug#18173] The feature in `$LOADED_FEATURES` is loaded again

Issue #18173 has been reported by nobu (Nobuyoshi Nakada).

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Bug #18173: The feature in `$LOADED_FEATURES` is loaded again
https://bugs.ruby-lang.org/issues/18173

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Backport: 2.6: REQUIRED, 2.7: REQUIRED, 3.0: REQUIRED
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In general, the feature name registered in `$LOADED_FEATURES` (e.g. "enumerator.so", "thread.rb", and so on) is expected not to be loaded again.

But, as @ko1 reported, when a feature name is added to the variable during another file is required, it will be loaded again.

```shell
$ echo 'raise __FILE__' > target.rb
$ echo '$" << "target.rb"' > provide.rb
$ ruby -r./provide.rb target.rb 
target.rb:1:in `<main>': target.rb (RuntimeError)
```




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