hg: jdk9/hs-comp/hotspot: 8081823: C2 performs unsigned comparison against -1

[roland.westrelin at oracle.com]

Changeset: 758cc95296c1
Author:    roland
Date:      2015-06-08 18:35 +0200
URL:       http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/758cc95296c1

8081823: C2 performs unsigned comparison against -1
Summary: x <= 0 || x > 0 wrongly folded as (x-1) >u -1
Reviewed-by: kvn, vlivanov

! src/share/vm/opto/ifnode.cpp
+ test/compiler/rangechecks/TestBadFoldCompare.java