Support class and typedef literals as expressions.

lib/compiler/implementation/dart_backend/placeholder_collector.dart

Index: lib/compiler/implementation/dart_backend/placeholder_collector.dart
diff --git a/lib/compiler/implementation/dart_backend/placeholder_collector.dart b/lib/compiler/implementation/dart_backend/placeholder_collector.dart
index 4a1432dcfe4cb393a6a90466f8370866ae1d22cd..b2d14b1e5f3d5a3f80229caec2d085e882abe643 100644
--- a/lib/compiler/implementation/dart_backend/placeholder_collector.dart
+++ b/lib/compiler/implementation/dart_backend/placeholder_collector.dart
@@ -134,7 +134,12 @@ class SendVisitor extends ResolvedVisitor {
   }
 
   internalError(String reason, {Node node}) {
-    collector.internalError(reason, node);
+    collector.internalError(reason, node: node);
+  }
+
+  visitTypeReferenceSend(Send node) {
+    ClassElement element = elements[node];
+    collector.makeElementPlaceholder(node.selector, element);
   }
 }
 
@@ -368,7 +373,7 @@ class PlaceholderCollector extends Visitor {
   }
 
   void internalError(String reason, {Node node}) {
-    compiler.cancel(reason: reason, node: node);
+    compiler.cancel(reason, node: node);
   }
 
   void unreachable() { internalError('Unreachable case'); }