Re: [streams] rsReader.readBatch(numberOfChunks)? rbsReader.read(view, { waitUntilDone: true })? (#320)

@domenic correctly pointed out on IRC that I need to prime the jit before my first measurement.  Doing this gives more realistic results for the 10 chunk case:

```
   10 chunks in pipe: sync-read: 0.5 us/chunk vs. promise-read: 39.3 us/chunk
```

So ~0.4ms to read 10 chunks buffered in a pipe.  Still much slower than the sync case, but not so slow in absolute terms to be considered ridiculously broken.

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