Re: [whatwg/streams] Various fixes for readable byte streams (#1123)

I also noticed that [ReadableByteStreamControllerRespondWithNewView](https://streams.spec.whatwg.org/#readable-byte-stream-controller-respond-with-new-view) can still throw an error *after* we've already updated the first pull-into descriptor's buffer to the new view's buffer. Specifically, [ReadableByteStreamControllerRespondInternal](https://streams.spec.whatwg.org/#readable-byte-stream-controller-respond-internal) may still throw a `TypeError` if *bytesWritten* is or is not zero (depending on whether we're in the readable or closed state).

I think we will need to turn these checks into asserts inside `RespondInternal()`, and throw errors in `Respond()` and `RespondWithNewView()`?

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