tree c2147bef1b422ec6f69757c275c55d260e606345
parent 048b4ac107c1d6f887414c369058c7c930c3468f
author MarkZ <markzipan@google.com> 1737670259 -0800
committer Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> 1737670259 -0800

[ddc] Updating representation of enums to support hot reload semantics.

Enums are now split between pre and post canonicalization members. A
separate operation during link-time is emitted for every const
enum field. These are required during link time since enhanced enums can have non-trivial type hierarchies.

Example for snippet:
```
enum E {
  e1(1), ...

  const E(this.i);
  final int i;
}

```

Used to emit enum fields as:
```
  dart.defineLazy(CT, {
    get C1() {
      return C[1] = dart.const(Object.setPrototypeOf({
        [_Enum__name]: "e1",
        [_Enum_index]: 0
        i: 1
      }, E.prototype));
    },
  }
```

Now emits them as:
```
// Declaration-time
  dart.defineLazy(CT, {
    get C1() {
      return C[1] = dart.const(Object.setPrototypeOf({
        [_Enum__name]: "e1",
      }, E.prototype));
    },
  }

// Link-time
    dart.extendEnum(dart.const(Object.setPrototypeOf({
      [_Enum__name]: "e1"
    }, E.prototype)), {
      i: 1,
      get index() {
        return E.values.indexOf(this);
      }
    });
```

Change-Id: Id5ce2ec117e59d8daa28df7fe6051e4a7e1a5bc1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/404723
Commit-Queue: Mark Zhou <markzipan@google.com>
Reviewed-by: Nicholas Shahan <nshahan@google.com>