Handle constants that mix eager and deferred types.

dart/tests/compiler/dart2js_extra/deferred/deferred_constant_test.dart

Index: dart/tests/compiler/dart2js_extra/deferred/deferred_constant_test.dart
diff --git a/dart/tests/compiler/dart2js_extra/deferred/deferred_constant_test.dart b/dart/tests/compiler/dart2js_extra/deferred/deferred_constant_test.dart
index f27bf45149aaa0b9715d3cdb2f08fa012ca40f8c..877289346d5e58728e22494a7f9b49b60ab22fe9 100644
--- a/dart/tests/compiler/dart2js_extra/deferred/deferred_constant_test.dart
+++ b/dart/tests/compiler/dart2js_extra/deferred/deferred_constant_test.dart
@@ -11,8 +11,9 @@ const lazy = const DeferredLibrary('deferred_class_library');
 
 main() {
   var x;
-  // TODO(ahe): What are the semantics of this:
-  // x = const MyClass();
+  Expect.isNull(const MyClass());
+  Expect.isNull(const Constant(42));
+  Expect.isNull(const [const Constant(42)]);
   Expect.isNull(x);
   int counter = 0;
   lazy.load().then((bool didLoad) {
@@ -21,6 +22,7 @@ main() {
     print('deferred_class_library was loaded');
     x = const MyClass();
     Expect.equals(42, x.foo(87));
+    Expect.listEquals(const [const Constant(42)], [new Constant(42)]);
   });
   Expect.equals(0, counter);
   Expect.isNull(x);
@@ -30,10 +32,11 @@ main() {
     print('deferred_class_library was loaded');
     x = const MyClass();
     Expect.equals(42, x.foo(87));
+    Expect.listEquals(const [const Constant(42)], [new Constant(42)]);
   });
   Expect.equals(0, counter);
   Expect.isNull(x);
-  // TODO(ahe): What are the semantics of this:
-  // x = const MyClass();
+  Expect.isNull(const Constant(42));
+  Expect.isNull(const [const Constant(42)]);
   Expect.isNull(x);
 }