Implement simple dynamic type check.

lib/compiler/implementation/universe.dart

Index: lib/compiler/implementation/universe.dart
diff --git a/lib/compiler/implementation/universe.dart b/lib/compiler/implementation/universe.dart
index c368ac74d17f56e6946ae2399ad48b4bb61d6eeb..5cf6c6bbdcef4c0441b7daa306182768e1eec072 100644
--- a/lib/compiler/implementation/universe.dart
+++ b/lib/compiler/implementation/universe.dart
@@ -14,6 +14,7 @@ class Universe {
   final Map<String, LibraryElement> libraries;
   // TODO(ngeoffray): This should be a Set<Type>.
   final Set<Element> isChecks;
+  final RuntimeTypeInformation rti;
 
   Universe() : generatedCode = new Map<Element, String>(),
                generatedBailoutCode = new Map<Element, String>(),
@@ -24,7 +25,8 @@ class Universe {
                invokedNames = new Map<SourceString, Set<Selector>>(),
                invokedGetters = new Map<SourceString, Set<Selector>>(),
                invokedSetters = new Map<SourceString, Set<Selector>>(),
-               isChecks = new Set<Element>();
+               isChecks = new Set<Element>(),
+               rti = new RuntimeTypeInformation();
 
   void addGeneratedCode(WorkItem work, String code) {
     generatedCode[work.element] = code;