zwuis wrote:
> We have a very confusing NNS interface:
>
> ```cpp
> NestedNameSpecifier() : NestedNameSpecifier(FlagKind::Invalid) {}
> NestedNameSpecifier(std::nullopt_t) : StoredOrFlag(0) {}
> ```
>
> That tripped me up (and that we probably should clean up)
If I remember correctly they were used for `DenseMap` (empty keys and tombstone
keys). CC @mizvekov
https://github.com/llvm/llvm-project/pull/219998
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