llvm-project

76bdc608 - [Legacy ThinLTO] NFC: Move helper class to an "Impl" namespace (#112846)

[Legacy ThinLTO] NFC: Move helper class to an "Impl" namespace (#112846) `::llvm::TargetMachineBuilder` is only a helper class for `ThinLTOCodeGenerator` and not a real facility. Move it into an "Impl" namespace.