Support type parameters and classes as expression in the vm.

tests/lib/lib.status

Index: tests/lib/lib.status
===================================================================
--- tests/lib/lib.status	(revision 24832)
+++ tests/lib/lib.status	(working copy)
@@ -10,15 +10,15 @@
 async/run_async4_test: Pass, Fail # no global exception handler in isolates. http://dartbug.com/9012
 async/run_async6_test: Fail # global error handling is not supported. http://dartbug.com/5958
 
-[ $compiler == dart2js  && $unchecked]
-async/stream_state_test: Fail # Issue 11722
-
 # SIMD is unsupported on dart2js.
 typed_data/float32x4_test: Fail, OK
 typed_data/float32x4_list_test: Fail, OK
 typed_data/float32x4_unbox_phi_test: Fail, OK
 typed_data/float32x4_unbox_regress_test: Fail, OK
 
+[ $compiler == dart2js  && $unchecked]
+async/stream_state_test: Fail # Issue 11722
+
 [ $compiler == dart2js && $checked ]
 async/catch_errors20_test: Fail # Issue 11470
 
@@ -108,7 +108,6 @@
 mirrors/reflectively_instantiate_uninstantiated_class_test: Fail # http://dartbug.com/11187
 mirrors/reflect_model_test: Fail # http://dartbug.com/11219
 mirrors/parameter_test: Fail # http://dartbug.com/11567
-mirrors/metadata_constructed_constant_test: Fail # http://dartbug.com/11609
 
 [ $compiler == none && $runtime == drt ]
 async/timer_isolate_test: Skip # See Issue 4997