[clang] [clang] Inject IndirectFieldDecl even if name conflicts. (PR #153140)

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keinflue wrote:

I am not entirely sure that this doesn't have any further side effects, but I think it makes sense to have the indirect fields nodes in the final AST even if they are invalid.

This should however probably at least be mentioned in the release notes, I am not entirely sure in which section though.

https://github.com/llvm/llvm-project/pull/153140