Normative: Check for detached buffers before calling HostResizeArrayBuffer

[anba]

ToIntegerOrInfinity can detach the buffer, adding an explicit IsDetachedBuffer call makes it more clear which error should be thrown in that case.

[anba]

This test throws a TypeError in V8, but a RangeError in JSC:

let buffer = new ArrayBuffer(4, {maxByteLength: 8});
buffer.resize({
  valueOf() {
    buffer.transfer();
    return 4;
  }
});

With the proposed change, a TypeError is expected.

[syg]

Suggested change

1. If IsDetachedBuffer(_O_) is *true*, throw a *TypeError* exception.

[syg]

In that case, given lack of interop right now between V8 and JSC, I'd prefer to sink the detached check to be after the _newLength_ coercion. I'll add it to the agenda.

[syg]

Oh actually this is just duplicated of #120.