Use inferred type in the SSA builder for super calls, and fix a bug with operator== in the type inf…

tests/language/operator_equals_test.dart

Index: tests/language/operator_equals_test.dart
===================================================================
--- tests/language/operator_equals_test.dart	(revision 0)
+++ tests/language/operator_equals_test.dart	(revision 0)
@@ -0,0 +1,18 @@
+// 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 infer [:super == null:]
+// always returns an int.
+
+class A {
+  operator==(other) => 42;
+}
+
+class B extends A {
+  foo() => (super == null) + 4;
+}
+
+main() {
+  Expect.throws(() => new B().foo(), (e) => e is NoSuchMethodError);
+}