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llvm::sys::fs::make_absolute converts its first parameter (const Twine &current_directory) to StringRef p(path.data(), path.size()), and then passes that StringRef to several functions (path::has_root_directory, path::has_root_name, and path::append) that accept Twines as parameters. Since llvm::StringRef can implicitly convert to an llvm::Twine, p converts to a bunch of Twine temporaries. In a few places, namely path::has_root_directory & path::has_root_name, that temporary Twine is again converted to a StringRef: bool...