Fix bug with CHA dependencies by recording a set of classes for registering code.

tests/language/cha_deopt3_test.dart

+// Copyright (c) 2014, 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.
+// VMOptions=--optimization-counter-threshold=100
+
+// Test lazy deoptimization at type checks with interface implementation.
+
+import "package:expect/expect.dart";
+import "cha_deopt3_lib.dart";
+import "cha_deopt3_deferred_lib.dart" deferred as d;
+
+var loaded = false;
+
+main() {
+  for (var i = 0; i < 2000; i++) bla();
+  Expect.equals(1, bla());
+  d.loadLibrary().then((_) {
+    loaded = true;
+    Expect.equals(1, bla());
+  });
+}
+
+make_array() {
+  try {
+    if (loaded) {
+      return [new A(), new B(), new C(), new D(), new E(), d.make_u()];
+    } else {
+      return [new A(), new B(), new C(), new D(), new E(), new T()];
+    }
+  } catch (e) { }
+}
+
+bla() {
+  var count = 0;
+  for (var x in make_array()) {
+    if (x is T) count++;
+  }
+  return count;
+}