Handle more unqualified SendSets

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 36c4618af8bf2ec80c840d35947108407a59a33c..941fb38550d1c48d860c3dcd4267fb632fd5369a 100644
--- a/pkg/compiler/lib/src/resolution/registry.dart
+++ b/pkg/compiler/lib/src/resolution/registry.dart
@@ -465,10 +465,12 @@ class ResolutionRegistry implements Registry {
   }
 
   void registerDynamicGetter(UniverseSelector selector) {
+    assert(selector.selector.isGetter);
     worldImpact.registerDynamicGetter(selector);
   }
 
   void registerDynamicSetter(UniverseSelector selector) {
+    assert(selector.selector.isSetter);
     worldImpact.registerDynamicSetter(selector);
   }