[8u40] RFA 8029452: Fork/Join task ForEachOps.ForEachOrderedTask clarifications and minor improvements

[Paul Sandoz]

Hi,

I would like to back port a fix from 9 to 8u40. Vladimir (Ivanov) kindly reminded me this has been soaking in 9 for quite a while. The main reason to back port is to size the ConcurrentHashMap used in the parallel forEachOrdered operation.
	
  https://bugs.openjdk.java.net/browse/JDK-8029452

  http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-January/024325.html

  http://hg.openjdk.java.net/jdk9/dev/jdk/rev/37d3ca4faca5

The patch applies cleanly and stream tests pass.

Paul.