More functionality in kernel_impact.

pkg/compiler/lib/src/resolution/registry.dart

Index: pkg/compiler/lib/src/resolution/registry.dart
diff --git a/pkg/compiler/lib/src/resolution/registry.dart b/pkg/compiler/lib/src/resolution/registry.dart
index da2c129a097142e08c1c09fadca8985a9859293e..51d7e81f0552eb998b84c2a86e3a535c8a735f49 100644
--- a/pkg/compiler/lib/src/resolution/registry.dart
+++ b/pkg/compiler/lib/src/resolution/registry.dart
@@ -331,6 +331,13 @@ class ResolutionRegistry extends Registry {
     impactBuilder.registerTypeUse(typeUse);
   }
 
+  /// Register checked mode check of [type] if it isn't `dynamic`.
+  void registerCheckedModeCheck(DartType type) {
+    if (!type.isDynamic) {
+      impactBuilder.registerTypeUse(new TypeUse.checkedModeCheck(type));
+    }
+  }
+
   void registerSuperUse(SourceSpan span) {
     mapping.addSuperUse(span);
   }