Fix oversight in side effects computation and closure calls.

tests/language/closure_side_effect_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.
+
+import "package:expect/expect.dart";
+
+var b;
+var a = () {
+  b = 42;
+};
+
+var c = [new C()];
+
+class C {
+  nonInlinable1() {
+    a();
+  }
+
+  nonInlinable2() {
+    var a = () { b = 42; };
+    a();
+  }
+}
+
+testClosureInStaticField() {
+  var temp = c[0];
+  Expect.isNull(b);
+  temp.nonInlinable1();
+  Expect.equals(42, b);
+  b = null;
+}
+
+testLocalClosure() {
+  var temp = c[0];
+  Expect.isNull(b);
+  temp.nonInlinable2();
+  Expect.equals(42, b);
+}
+
+main() {
+  testClosureInStaticField();
+  testLocalClosure();
+}