[llvm] [DebugInfo] Move `codeview::SourceLanguage` enumerators to CodeViewLanguages.def (NFC) (PR #141750)

[Carlos Alberto Enciso via llvm-commits]

CarlosAlbertoEnciso wrote:

> > @jalopezg-git Have you solved your permission access?
> 
> No news yet; apparently, it's taking a bit long. @CarlosAlbertoEnciso, could you merge this on my behalf?

Happy to do it.
As the PR description contains other comments, would you be happy with the following text?
Added the `CodeView` label.
```
[DebugInfo][CodeView] Move codeview::SourceLanguage enumerators to CodeViewLanguages.def (NFC) #141750

This PR proposes moving out enumerators for codeview::SourceLanguage
to a separate CodeViewLanguages.def file, following the same guideline
that in other parts of LLVM, and in particular the TypeRecordKind
(enumerators in CodeViewTypes.def) or SymbolRecordKind (enumerators
in CodeViewSymbols.def).

This is a non-functional change, and has been labeled as such.
This change helps for https://github.com/llvm/llvm-project/pull/137223,
and possibly other future changes.
```


https://github.com/llvm/llvm-project/pull/141750