Handle compile-time constness for conditionals and type literal calls.

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
index 6cc883159cde6d55b89fd280cde8055fd4bf1e8d..754e5aa0bad1b1481b6868da298300901da924c3 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
@@ -757,6 +757,10 @@ class JavaScriptBackend extends Backend {
       // An interceptor constant references the class's prototype chain.
       InterceptorConstant interceptor = constant;
       registerInstantiatedConstantType(interceptor.dispatchedType, elements);
+    } else if (constant.isType()) {
+      TypeConstant typeConstant = constant;
+      registerTypeLiteral(typeConstant.representedType.element,
+          compiler.enqueuer.codegen, elements);
     }
   }