hg: lambda/lambda/jdk: Cautiously revert back to forking the left task

[paul.sandoz at oracle.com]

Changeset: 34de21e14254
Author:    psandoz
Date:      2013-04-12 14:00 +0200
URL:       http://hg.openjdk.java.net/lambda/lambda/jdk/rev/34de21e14254

Cautiously revert back to forking the left task
rather than executing using the common pool.
Should only do the latter for an external forks.

! src/share/classes/java/util/stream/AbstractTask.java