hg: jdk9/hs-comp/hotspot: 8078563: Restrict reduction optimization

[vladimir.kozlov at oracle.com]

Changeset: a05f3d301196
Author:    kvn
Date:      2015-04-29 15:34 -0700
URL:       http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/a05f3d301196

8078563: Restrict reduction optimization
Reviewed-by: kvn, twisti
Contributed-by: michael.c.berg at intel.com

! src/share/vm/opto/superword.cpp
! src/share/vm/opto/superword.hpp
+ test/compiler/loopopts/superword/ReductionPerf.java