hg: jdk9/hs/hotspot: 8175887: C1 value numbering handling of Unsafe.get*Volatile is incorrect

[vladimir.x.ivanov at oracle.com]

Changeset: 2ff05d967fb2
Author:    shade
Date:      2017-03-01 14:51 +0300
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/2ff05d967fb2

8175887: C1 value numbering handling of Unsafe.get*Volatile is incorrect
Reviewed-by: vlivanov

! src/share/vm/c1/c1_ValueMap.hpp
+ test/compiler/c1/UnsafeVolatileGuardTest.java
+ test/compiler/c1/VolatileGuardTest.java