Fix first part on liveness analysis of bug https://code.google.com/p/dart/issues/detail?id=9687: a …

tests/language/execute_finally12_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Regression test for dart2js that used to not treat the finally
+// block as a successor of a nested try block.
+
+import "package:expect/expect.dart";
+
+var a;
+
+foo() {
+  var b = a == 8; // This should not be GVN'ed.
+  while (!b) {
+    try {
+      try {
+      } finally {
+        a = 8;
+        break;
+      }
+    } finally {
+      return a == 8;
+    }
+  }
+}
+
+main() {
+  Expect.isTrue(foo());
+}