--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/cfg/HIRLoop.java	2017-02-15 17:07:11.015049797 -0800
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.compiler.nodes.cfg;
+
+import org.graalvm.compiler.core.common.LocationIdentity;
+import org.graalvm.compiler.core.common.cfg.Loop;
+import org.graalvm.compiler.nodes.LoopBeginNode;
+
+public final class HIRLoop extends Loop<Block> {
+
+    private LocationSet killLocations;
+
+    protected HIRLoop(Loop<Block> parent, int index, Block header) {
+        super(parent, index, header);
+    }
+
+    @Override
+    public long numBackedges() {
+        return ((LoopBeginNode) getHeader().getBeginNode()).loopEnds().count();
+    }
+
+    public LocationSet getKillLocations() {
+        if (killLocations == null) {
+            killLocations = new LocationSet();
+            for (Block b : this.getBlocks()) {
+                if (b.getLoop() == this) {
+                    killLocations.addAll(b.getKillLocations());
+                    if (killLocations.isAny()) {
+                        break;
+                    }
+                }
+            }
+        }
+        for (Loop<Block> child : this.getChildren()) {
+            if (killLocations.isAny()) {
+                break;
+            }
+            killLocations.addAll(((HIRLoop) child).getKillLocations());
+        }
+        return killLocations;
+    }
+
+    public boolean canKill(LocationIdentity location) {
+        return getKillLocations().contains(location);
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() + " header:" + getHeader().getBeginNode();
+    }
+}