namespace {

// Simple raw_ostream that prints to a file (doesn't take ownership).
struct WritableFileRawStream : public llvm::raw_ostream {
  explicit WritableFileRawStream(WritableFile* file) : file(file) {
    SetUnbuffered();
  }
  ~WritableFileRawStream() override = default;
  uint64_t current_pos() const override { return 0; }

  void write_impl(const char* ptr, size_t size) override {