RFR 8019395 Consolidate StreamSupport.{stream, parallelStream} into a single method

[Paul Sandoz]

Hi,

This patch reduced the methods on j.u.stream.StreamSupport from 16 to 8:

  http://cr.openjdk.java.net/~psandoz/tl/JDK-8019395-StreamSupport/webrev/

Instead of methods stream/parallelStream, and inStream/intParallelStream etc, there is just stream, and intStream etc, that take a boolean value controlling whether the stream is parallel or sequential.

There are lots of small changes to source due to the refactoring (most which was done automatically).

Paul.