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Jon Ross-PerkinsandDana Jansens
8166f9a7cf
This turns `Cpp` into a keyword, and makes it map to `NameId::Cpp` and `PackageNameId::Cpp`. Per discussion with zygoloid, the keyword versus identifier question is deliberately kept open by #4846. This PR switches to a keyword because mapping to a specific `PackageNameId` works best with a special `NameId` not backed by an `IdentifierId`. We could in theory make it work using `IdentifierId` or a runtime-tracked `PackageNameId` for `Cpp` (e.g. stored on `SemIR::File`), but this approach is consistent with `Core` and so seemed like a good starting point. --------- Co-authored-by: Dana Jansens <danakj@orodu.net>