JDK-8352891 Performance improvements to ByteArrayOutputStream

[Engebretson, John]

I think there is agreement that ByteArrayOutputStream.unsynchronized(int cap) (or some such method) would be useful. It would not require using a contiguous byte[] as the backing array so there is scope to experiment with implementations that don't need to resize like the base BAOS does.

Extending BOAS means the size is limited to an int. To go beyond would be a different API and there is lots of scope to do experiments. I think too early to create a CSR for MOS, assuming this is what you mean.

  Thank you Alan!  PR [1] is updated with the factory method as suggested; MOS is a package-private subclass of BAOS and the Javadoc in BAOS makes no promises about the implementation returned.  I allowed MOS to grow beyond 2GB and throw an intelligent error if it cannot service a particular call (toByteArray, size, etc.).  Performance is unchanged.  Feedback appreciated.
  Thanks!  😊
     John

[1] https://github.com/openjdk/jdk/pull/24232

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