message: fix typo in function decl printing
diff: @@ -119,7 +119,7 @@ void Function::print(ostream &os, bool print_header) const {
  }
  if (print_header) {
  - os << "declare " << getType() << " @" << name << '(';
  + os << "define " << getType() << " @" << name << '(';
  bool first = true;
  for (auto &input : getInputs()) {
  if (!first)
  