--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core/src/org/graalvm/compiler/core/phases/BaseTier.java	Thu Oct 31 16:54:16 2019 -0700
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2019, 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.phases;
+
+import static org.graalvm.compiler.core.common.GraalOptions.ImmutableCode;
+
+import org.graalvm.compiler.loop.DefaultLoopPolicies;
+import org.graalvm.compiler.loop.LoopPolicies;
+import org.graalvm.compiler.options.OptionValues;
+import org.graalvm.compiler.phases.PhaseSuite;
+import org.graalvm.compiler.phases.common.CanonicalizerPhase;
+
+public class BaseTier<C> extends PhaseSuite<C> {
+
+    public LoopPolicies createLoopPolicies() {
+        return new DefaultLoopPolicies();
+    }
+
+    public CanonicalizerPhase createCanonicalizerPhase(OptionValues options) {
+        CanonicalizerPhase canonicalizer = null;
+        if (ImmutableCode.getValue(options)) {
+            canonicalizer = CanonicalizerPhase.createWithoutReadCanonicalization();
+        } else {
+            canonicalizer = CanonicalizerPhase.create();
+        }
+        return canonicalizer;
+    }
+}