Compile tearoffs of static functions as constants.

pkg/fletchc/lib/src/fletch_backend.dart

Index: pkg/fletchc/lib/src/fletch_backend.dart
diff --git a/pkg/fletchc/lib/src/fletch_backend.dart b/pkg/fletchc/lib/src/fletch_backend.dart
index 8d5d5703d209e5d65e03144b3b9a7c589d94af95..24bfad9a26b445815bac8d4e244e8e18b2ccba03 100644
--- a/pkg/fletchc/lib/src/fletch_backend.dart
+++ b/pkg/fletchc/lib/src/fletch_backend.dart
@@ -75,7 +75,8 @@ import 'package:compiler/src/library_loader.dart' show
 
 import 'fletch_constants.dart' show
     FletchClassConstant,
-    FletchFunctionConstant;
+    FletchFunctionConstant,
+    FletchClassInstanceConstant;
 
 import 'compiled_function.dart' show
     CompiledFunction;
@@ -922,6 +923,10 @@ class FletchBackend extends Backend {
         commands
             ..add(new PushFromMap(MapId.classes, compiledClass.id))
             ..add(const PushNewInstance());
+      } else if (constant is FletchClassInstanceConstant) {
+        commands
+            ..add(new PushFromMap(MapId.classes, constant.classId))
+            ..add(const PushNewInstance());
       } else {
         throw "Unsupported constant: ${constant.toStructuredString()}";
       }