message: spectest: support assert_malformed instruction
diff: @@ -155,8 +155,16 @@ public:
  pass();
  }
  - else if (type == "assert_invalid")
  + else if (type == "assert_invalid" || type == "assert_malformed")
  {
  + // NOTE: assert_malformed should result in a parser error and
  + // assert_invalid should result in a validation error
  + const auto module_type = cmd.at("module_type").get<std::string>();
  + if (module_type != "binary")
  + {
  + skip("Only binary modules are supported.");
  + continue;
  + }
  const auto filename = cmd.at("filename").get<std::string>();
  const auto wasm_binary = load_wasm_file(path, filename);
  try
  