hg: jdk9/hs-comp/hotspot: 8143542: C2 doesn't eliminate identical checks

[roland.westrelin at oracle.com]

Changeset: 894c8b63e200
Author:    roland
Date:      2016-02-03 12:36 +0100
URL:       http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/894c8b63e200

8143542: C2 doesn't eliminate identical checks
Summary: Two identical Ifs back to back can be merged
Reviewed-by: kvn

! src/share/vm/opto/castnode.cpp
! src/share/vm/opto/loopnode.hpp
! src/share/vm/opto/loopopts.cpp