[llvm] r264425 - [Object] Start threading Error through MachOObjectFile construction.

[Rafael Espíndola via llvm-commits]

>  static const char *ProgramName;
>
> -static int Error(const Twine &Msg) {
> +static int ErrorAndExit(const Twine &Msg) {
>    errs() << ProgramName << ": error: " << Msg << "\n";
> -  return 1;
> +  exit(1);
>  }

This can now return void.