jsr166y/openjdk resync

[Doug Lea]

A few months ago, we simplified some of the APIs to the ForkJoin
classes (mainly, removing some methods so as to allow better
internal automation). The "jsr1yy6" versions of these
API changes have been in use since then, and we're confident
that these changes (and corresponding internal implementation
improvements) should go into the openjdk7 versions.
In case you are curious, some discussions about them
can be found in concurrency-interest list archives, including
http://cs.oswego.edu/pipermail/concurrency-interest/2010-June/007243.html

So we (mainly Martin Buchholz and I) would like to do this.
Since they involve API changes, I suspect there might be some
additional process requirements beyond us just doing the
mercurial commits. If so, can someone let us know what they
are? We already arranged to have corresponding JCK/TCK tests
updated.

-Doug