Handle deferred access of unserialized code.

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index 7f7a37f4cda11ceff98e2fa204c56b9df0f6aad8..f44ab1381ba80d6ac927bb008254799cbcadcceb 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -2022,13 +2022,20 @@ class _CompilerResolution implements Resolution {
         // Only analyze nodes with a corresponding [TreeElements].
         compiler.checker.check(element);
       }
-      WorldImpact worldImpact = compiler.backend.impactTransformer
-          .transformResolutionImpact(resolutionImpact);
-      return worldImpact;
+      return transformResolutionImpact(element, resolutionImpact);
     });
   }
 
   @override
+  WorldImpact transformResolutionImpact(
+      Element element, ResolutionImpact resolutionImpact) {
+    WorldImpact worldImpact = compiler.backend.impactTransformer
+        .transformResolutionImpact(resolutionImpact);
+    _worldImpactCache[element] = worldImpact;
+    return worldImpact;
+  }
+
+  @override
   void uncacheWorldImpact(Element element) {
     assert(invariant(element, element.isDeclaration,
         message: "Element $element must be the declaration."));