--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/alloc/SingleBlockTraceBuilder.java	2016-12-07 13:47:54.408267187 -0800
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 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.core.common.alloc;
+
+import java.util.ArrayList;
+
+import org.graalvm.compiler.core.common.alloc.TraceBuilderResult.TrivialTracePredicate;
+import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
+
+/**
+ * Builds traces consisting of a single basic block.
+ */
+public final class SingleBlockTraceBuilder {
+
+    public static TraceBuilderResult computeTraces(AbstractBlockBase<?> startBlock, AbstractBlockBase<?>[] blocks, TrivialTracePredicate pred) {
+        return build(startBlock, blocks, pred);
+    }
+
+    private static TraceBuilderResult build(AbstractBlockBase<?> startBlock, AbstractBlockBase<?>[] blocks, TrivialTracePredicate pred) {
+        Trace[] blockToTrace = new Trace[blocks.length];
+        ArrayList<Trace> traces = new ArrayList<>(blocks.length);
+
+        for (AbstractBlockBase<?> block : blocks) {
+            Trace trace = new Trace(new AbstractBlockBase<?>[]{block});
+            blockToTrace[block.getId()] = trace;
+            block.setLinearScanNumber(0);
+            trace.setId(traces.size());
+            traces.add(trace);
+        }
+
+        assert traces.get(0).getBlocks()[0].equals(startBlock) : "The first traces always contains the start block";
+        return TraceBuilderResult.create(blocks, traces, blockToTrace, pred);
+    }
+
+}