Pass ClosedWorld directly to codegen tasks

pkg/compiler/lib/src/ssa/interceptor_simplifier.dart

Index: pkg/compiler/lib/src/ssa/interceptor_simplifier.dart
diff --git a/pkg/compiler/lib/src/ssa/interceptor_simplifier.dart b/pkg/compiler/lib/src/ssa/interceptor_simplifier.dart
index 17de116538102a12c66919e4619a3d9b6f148551..6855b8c34c57ddd8f6c3bceec93034150910c68f 100644
--- a/pkg/compiler/lib/src/ssa/interceptor_simplifier.dart
+++ b/pkg/compiler/lib/src/ssa/interceptor_simplifier.dart
@@ -37,17 +37,17 @@ import 'optimize.dart';
 class SsaSimplifyInterceptors extends HBaseVisitor
     implements OptimizationPhase {
   final String name = "SsaSimplifyInterceptors";
+  final ClosedWorld closedWorld;
   final ConstantSystem constantSystem;
   final Compiler compiler;
   final Element element;
   HGraph graph;
 
-  SsaSimplifyInterceptors(this.compiler, this.constantSystem, this.element);
+  SsaSimplifyInterceptors(
+      this.compiler, this.closedWorld, this.constantSystem, this.element);
 
   JavaScriptBackend get backend => compiler.backend;
 
-  ClosedWorld get closedWorld => compiler.closedWorld;
-
   BackendClasses get backendClasses => closedWorld.backendClasses;
 
   void visitGraph(HGraph graph) {