Register type constants through ConstantUse

pkg/compiler/lib/src/common/codegen.dart

Index: pkg/compiler/lib/src/common/codegen.dart
diff --git a/pkg/compiler/lib/src/common/codegen.dart b/pkg/compiler/lib/src/common/codegen.dart
index 6ac632897cb19cd2dd74a14b442a3655705506b7..dea9ca481a3105c01e6a41f4ba16122d1584cf1d 100644
--- a/pkg/compiler/lib/src/common/codegen.dart
+++ b/pkg/compiler/lib/src/common/codegen.dart
@@ -39,8 +39,6 @@ class CodegenImpact extends WorldImpact {
 
   bool get usesInterceptor => false;
 
-  Iterable<ClassElement> get typeConstants => const <ClassElement>[];
-
   Iterable<Element> get asyncMarkers => const <FunctionElement>[];
 }
 
@@ -50,7 +48,6 @@ class _CodegenImpact extends WorldImpactBuilderImpl implements CodegenImpact {
   Setlet<String> _constSymbols;
   List<Set<ClassElement>> _specializedGetInterceptors;
   bool _usesInterceptor = false;
-  Setlet<ClassElement> _typeConstants;
   Setlet<FunctionElement> _asyncMarkers;
 
   _CodegenImpact();
@@ -108,17 +105,6 @@ class _CodegenImpact extends WorldImpactBuilderImpl implements CodegenImpact {
 
   bool get usesInterceptor => _usesInterceptor;
 
-  void registerTypeConstant(ClassElement element) {
-    if (_typeConstants == null) {
-      _typeConstants = new Setlet<ClassElement>();
-    }
-    _typeConstants.add(element);
-  }
-
-  Iterable<ClassElement> get typeConstants {
-    return _typeConstants != null ? _typeConstants : const <ClassElement>[];
-  }
-
   void registerAsyncMarker(FunctionElement element) {
     if (_asyncMarkers == null) {
       _asyncMarkers = new Setlet<FunctionElement>();
@@ -187,10 +173,6 @@ class CodegenRegistry {
     worldImpact.registerUseInterceptor();
   }
 
-  void registerTypeConstant(ClassElement element) {
-    worldImpact.registerTypeConstant(element);
-  }
-
   void registerInstantiation(ResolutionInterfaceType type) {
     registerTypeUse(new TypeUse.instantiation(type));
   }