Teach treeshaker about new cached functions and classes.

runtime/vm/object_store.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/object_store.h"
 
 #include "vm/exceptions.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 231 matching lines @@
   cls = async_lib.LookupClass(Symbols::StreamIterator());
   ASSERT(!cls.IsNull());
   set_stream_iterator_class(cls);
 
   String& function_name = String::Handle(zone);
   Function& function = Function::Handle(zone);
   function_name ^= async_lib.PrivateName(Symbols::SetAsyncThreadStackTrace());
   ASSERT(!function_name.IsNull());
   function ^= Resolver::ResolveStatic(async_lib, Object::null_string(),
                                       function_name, 1, Object::null_array());
+  ASSERT(!function.IsNull());
   set_async_set_thread_stack_trace(function);
 
   function_name ^= async_lib.PrivateName(Symbols::ClearAsyncThreadStackTrace());
   ASSERT(!function_name.IsNull());
   function ^= Resolver::ResolveStatic(async_lib, Object::null_string(),
                                       function_name, 0, Object::null_array());
   ASSERT(!function.IsNull());
   set_async_clear_thread_stack_trace(function);
 
 
@@ skipping 48 matching lines @@
   simple_instance_of_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOf());
   simple_instance_of_true_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOfTrue());
   simple_instance_of_false_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOfFalse());
 #endif
 }
 
 }  // namespace dart