Request for Approval: Backport of 8231988 : Unexpected test result caused by C2 IdealLoopTree::do_remove_empty_loop

[Yangfei (Felix)]

Hi,



May I got review for the backport of 8231988 to 8u master repo please?  This fixes a C2 bug which is level P2.



Patch does not apply cleanly to 8u due to file path difference.

Webrev: http://cr.openjdk.java.net/~fyang/8231988-8u-backport/webrev.00/



       Bug: https://bugs.openjdk.java.net/browse/JDK-8231988
       Upstream Changeset: https://hg.openjdk.java.net/jdk/jdk/rev/45a085445a8c

New test fails without the patch, and passes with it.
Jtreg test pass with the patch.


Thanks,
Felix