hg: jdk8u/jdk8u-dev/hotspot: 8231988: Unexpected test result caused by C2 IdealLoopTree::do_remove_empty_loop

[gnu.andrew at redhat.com]

Changeset: eee5798e1b28
Author:    fyang
Date:      2019-10-28 13:29 +0800
URL:       https://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/eee5798e1b28

8231988: Unexpected test result caused by C2 IdealLoopTree::do_remove_empty_loop
Summary: Duplicate cmp node in empty loop if it has other users
Reviewed-by: neliasso, thartmann
Contributed-by: wanghuang3 at huawei.com, xietuo at huawei.com

! src/share/vm/opto/loopTransform.cpp
+ test/compiler/loopopts/TestRemoveEmptyLoop.java