[interpreter] Fix canonicalization when preserving bytecode.

test/mjsunit/regress/regress-crbug-638551.js

Index: test/mjsunit/regress/regress-crbug-638551.js
diff --git a/test/mjsunit/regress/regress-crbug-638551.js b/test/mjsunit/regress/regress-crbug-638551.js
new file mode 100644
index 0000000000000000000000000000000000000000..baa8e9b051aa1c0df552282303d531ae118c1825
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-638551.js
@@ -0,0 +1,18 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --expose-gc --ignition-staging --no-lazy
+
+function f() {
+  for (var i = 0; i < 10; i++) if (i == 5) %OptimizeOsr();
+  function g() {}
+  %OptimizeFunctionOnNextCall(g);
+  g();
+}
+f();
+gc();  // Make sure that ...
+gc();  // ... code flushing ...
+gc();  // ... clears code ...
+gc();  // ... attached to {g}.
+f();