[8u40] Request for Approval: 8059844: Implement optimistic splitter

[Attila Szegedi]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8059844
jdk9 webrev: http://cr.openjdk.java.net/~attila/8059844/webrev.02
jdk9 review thread: http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-October/003595.html

Change did not apply cleanly to jdk8u-dev after path reshuffling from modular source code layout. The reason is a parser change in the Nashorn 9 that is not backported to 8, and subsequent difference in constructor signatures of a class used by this issue. Therefore, invocations of the said constructors had to be adjusted. A separate diff documenting the change between the 9 and 8 version of the code was published at <http://cr.openjdk.java.net/~attila/8059844/webrev-8-backport/index.html> for review and approved as part of the above review thread; I have re-run all the tests after the adjustment.

Thanks,
  Attila.