hg: shenandoah/jdk9/hotspot: Cherry pick fix for "8175887: C1 value numbering handling of Unsafe.get*Volatile is incorrect".

[ashipile at redhat.com]

Changeset: cba65b85b10c
Author:    shade
Date:      2017-03-13 13:14 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/cba65b85b10c

Cherry pick fix for "8175887: C1 value numbering handling of Unsafe.get*Volatile is incorrect".

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