Support per-library serialization.

pkg/compiler/lib/src/serialization/impact_serialization.dart

Index: pkg/compiler/lib/src/serialization/impact_serialization.dart
diff --git a/pkg/compiler/lib/src/serialization/impact_serialization.dart b/pkg/compiler/lib/src/serialization/impact_serialization.dart
index 92e68c5ce3a1e14df90d271e96cbc2bb347a706f..ef86609a0d5136e33e7b7be69f68e7a1b233798c 100644
--- a/pkg/compiler/lib/src/serialization/impact_serialization.dart
+++ b/pkg/compiler/lib/src/serialization/impact_serialization.dart
@@ -47,6 +47,11 @@ class ImpactSerializer implements WorldImpactVisitor {
 
   @override
   void visitStaticUse(StaticUse staticUse) {
+    if (staticUse.element.isGenerativeConstructor &&
+        staticUse.element.enclosingClass.isUnnamedMixinApplication) {
+      // TODO(johnniwinther): Handle static use of forwarding constructors.
+      return;
+    }
     ObjectEncoder object = staticUses.createObject();
     object.setEnum(Key.KIND, staticUse.kind);
     object.setElement(Key.ELEMENT, staticUse.element);