Start propagating non-primitive types in the backend, and fold instructions that know about the typ…

lib/compiler/implementation/compiler.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class WorkItem {
   final Element element;
   TreeElements resolutionTree;
   Function run;
   bool allowSpeculativeOptimization = true;
   List<HTypeGuard> guards = const <HTypeGuard>[];
@@ skipping 367 matching lines @@
   void registerGetOfStaticFunction(FunctionElement element) {
     registerStaticUse(element);
     universe.staticFunctionsNeedingGetter.add(element);
   }
 
   void registerDynamicInvocation(SourceString methodName, Selector selector) {
     assert(selector !== null);
     enqueuer.registerInvocation(methodName, selector);
   }
 
+  void registerDynamicInvocationOf(Element element) {
+    addToWorkList(element);
+  }
+
   void registerDynamicGetter(SourceString methodName) {
     enqueuer.registerGetter(methodName);
   }
 
   void registerDynamicSetter(SourceString methodName) {
     enqueuer.registerSetter(methodName);
   }
 
   void registerInstantiatedClass(ClassElement element) {
     universe.instantiatedClasses.add(element);
@@ skipping 153 matching lines @@
   }
 }
 
 class SourceSpan {
   final Uri uri;
   final int begin;
   final int end;
 
   const SourceSpan(this.uri, this.begin, this.end);
 }