Implement subtype checks on type arguments.

sdk/lib/_internal/compiler/implementation/ssa/builder.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.
 
 part of ssa;
 
 /**
  * A special element for the extra parameter taken by intercepted
  * methods. We need to override [Element.computeType] because our
  * optimizers may look at its declared type.
@@ skipping 3569 matching lines @@
       Constant constant = handler.compileNodeWithDefinitions(node, elements);
       stack.add(graph.addConstant(constant));
     } else {
       DartType type = elements.getType(node);
       if (compiler.enableTypeAssertions && type.isMalformed) {
         String reasons = fetchReasonsFromMalformedType(type);
         // TODO(johnniwinther): Change to resemble type errors from bounds check
         // on type arguments.
         generateRuntimeError(node, '$type is malformed: $reasons');
       } else {
+        // TODO(karlklose): move this type registration to the codegen.
+        compiler.codegenWorld.instantiatedTypes.add(type);
         visitNewSend(node.send, type);
       }
     }
   }
 
   visitSendSet(SendSet node) {
     Element element = elements[node];
     if (!Elements.isUnresolved(element) && element.impliesType()) {
       Identifier selector = node.selector;
       generateThrowNoSuchMethod(node, selector.source.slowToString(),
@@ skipping 1432 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }