Odd problem with command line options

Hi Jay,

        cerr << ProgramName << ": CommandLine Error: Argument '"
             << OptionNames[0] << "' defined more than once!\n";

should be printing OptionNames[i], not OptionNames[0].

I committed this fix,
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20080526/063136.html

Thanks!