message: Fix error string set in AddName to take a StringRef.
diff: @@ -837,7 +837,7 @@ bool Breakpoint::AddName(llvm::StringRef new_name, Status &error) {
  if (new_name.empty())
  return false;
  if (!BreakpointID::StringIsBreakpointName(new_name, error)) {
  - error.SetErrorStringWithFormat("input name \"%s\" not a breakpoint name.",
  + error.SetErrorStringWithFormatv("input name \"{0}\" not a breakpoint name.",
  new_name);
  return false;
  }
  