Add a -Wclass-varargs to warn on objects of any class type being passed through an ellipsis. Since C++11 relaxed the rules on this, we allow a lot more bad code through silently, such as:

  const char *format = "%s";
  std::experimental::string_view view = "foo";
  printf(format, view);

In this case, not only warn about a class type being used here, but also suggest that calling c_str() might be a good idea.

llvm-svn: 202461

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