Make Array.fromAsync elements enumerable

[littledivy]

Array.fromAsync built its result with Object.defineProperty and no enumerable flag, so the elements defaulted to non-enumerable. The spec adds them with CreateDataPropertyOrThrow, which creates enumerable own data properties, so Object.keys(), spread and for-in should see them.

const arr = await Array.fromAsync([10, 20, 30]);
Object.keys(arr);                               // before: []   after: ["0","1","2"]
Object.getOwnPropertyDescriptor(arr, 0).enumerable; // before: false  after: true

descriptor field	before	after
value	✓	✓
writable	true	true
configurable	true	true
enumerable	false	true

Disclaimer: This is an AI-assisted patch from the v8x project.