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kotlinlang

Hi, how is it possible that I get this warning during compilation with 1.4.20-M2?
```w: Flag is not supported by this version of the compiler: -XInlineClasses```

If I remember correctly, it changed recently, probably with 1.4.0

That's weird given the Kotlin Multiplatform reference shows this example:
```enableLanguageFeature("InlineClasses") // language feature name```

Not sure how this work with language feature dsl, this is freeCompilerFlag

Language features is
```-XXLanguage:+InlineClasses,```
