Do not eagerly finalize classes in CHA, instead regard unfinalized classes as ’non-existent’ an…

tests/language/deopt_lazy_finalization_test.dart

+// Copyright (c) 2012, 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.
+// Test deoptimziation caused by lazy finalization.
+// VMOptions=--optimization-counter-threshold=10 --no-use-osr
+
+import "package:expect/expect.dart";
+
+main() {
+  Expect.equals(20000, part1());
+  // Trigger lazy finalization of class B, which should invalidate
+  // optimized code for A.loop.
+  Expect.equals(-20000, part2());
+}
+
+part1() {
+  var a = new A();
+  a.loop();
+  return a.loop();

[regis, 2013/11/21 21:48:18]

If there is a reason to call a.loop() twice, you should add a comment.

[srdjan, 2013/11/21 22:25:00]

Added comments. The reason is that only second time we call into optimized code
(OSR is off).

+}
+
+part2() {
+  var b = new B();
+  b.loop();
+  return b.loop();

[regis, 2013/11/21 21:48:18]

ditto

[srdjan, 2013/11/21 22:25:00]

Done.

+}
+
+class A {
+  foo() => 2;
+  
+  loop() {
+    var sum = 0;
+    for (int i = 0; i < 10000; i++) {
+      sum += foo();
+    }
+    return sum;
+  }
+}
+
+class B extends A {
+  foo() => -2;
+}