Refactor ConstantSystem

pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart

Index: pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
diff --git a/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart b/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
index 71065d5c8e0050aa975d22ac999816eb7b0dbf7a..ef2f47a3ee1dcf8ee4da44503f62737839f64e25 100644
--- a/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
+++ b/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
@@ -233,8 +233,10 @@ class LookupMapAnalysis {
       key.isPrimitive || _inUse.contains(key) || _overridesEquals(key);
 
   void _addClassUse(ClassElement cls) {
-    ConstantValue key = _typeConstants.putIfAbsent(cls,
-        () => backend.constantSystem.createType(backend.compiler, cls.rawType));
+    ConstantValue key = _typeConstants.putIfAbsent(
+        cls,
+        () => backend.constantSystem.createType(
+            backend.commonElements, backend.backendClasses, cls.rawType));
     _addUse(key);
   }