message: mlir-tblgen: Dump input records when no generator is set
  Follow LLVM's tblgen convention when no generator is set instead of asserting.
diff: @@ -74,7 +74,10 @@ const mlir::GenInfo *generator;
  // TableGenMain requires a function pointer so this function is passed in which
  // simply wraps the call to the generator.
  static bool MlirTableGenMain(raw_ostream &os, RecordKeeper &records) {
  - assert(generator && "no generator specified");
  + if (!generator) {
  + os << records;
  + return false;
  + }
  return generator->invoke(records, os);
  }
  