Re: [whatwg/streams] Performance improvements (#490)

@domenic, while I agree that this is a reference implementation & exact semantics should trump performance, I am not sure that there *is* actually a change in semantics here.

- My understanding of those `Object.defineProperty ` calls is that since they don't actually deviate from regular property settings (enumerable / writable / configurable), they are semantically identical to a regular property. Is there a difference I am missing here?
- The try/catch change does not seem to change semantics either, unless there is a way this code could throw an exception:
```javascript
if (method === undefined) {
  return Promise.resolve(undefined);
}
```

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