[Enhanced enums] No error in CFE on user-written 'values' declaration

[sgrekhov]

The following co19 test fails on CFE

enum E1<T> {
  e1,
  e2,
  e3;

  static int values = 42;
//           ^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}

enum E2<T> {
  e1,
  e2,
  e3;

  static final int values = 42;
//                 ^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}

enum E3<T> {
  e1<int>(1),
  e2<String>("2"),
  e3<bool>(true);

  const E3(Object val);
  static List<E3> values = [];
//                ^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}

enum E4<T> {
  e1<int>(1),
  e2<String>("2"),
  e3<bool>(true);

  const E4(Object val);
  static final List<E4> values = [];
//                      ^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  E1.e1;
  E2.e1;
  E3.e1;
  E4.e1;
}

Expected errors are not reported in CFE but should be.

Tested on Dart SDK version: 2.17.0-edge.4fb3d2afcf424ff3f73d55fc1585c448cdaa8762 (be) (Thu Feb 10 03:16:20 2022 +0000) on "linux_x64"