Move most codegen registrations into WorldImpact.

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

Index: pkg/compiler/lib/src/js_backend/custom_elements_analysis.dart
diff --git a/pkg/compiler/lib/src/js_backend/custom_elements_analysis.dart b/pkg/compiler/lib/src/js_backend/custom_elements_analysis.dart
index b43fd9a9c0879a7c73dd4e580fc1288340641767..f9a0e8b08b50bc8b297d85c6d3b40f840ab50d67 100644
--- a/pkg/compiler/lib/src/js_backend/custom_elements_analysis.dart
+++ b/pkg/compiler/lib/src/js_backend/custom_elements_analysis.dart
@@ -91,9 +91,8 @@ class CustomElementsAnalysis {
     }
   }
 
-  void registerTypeConstant(Element element, Enqueuer enqueuer) {
+  void registerTypeConstant(Element element) {
     assert(element.isClass);
-    assert(!enqueuer.isResolutionQueue);
     codegenJoin.selectedClasses.add(element);
   }