Teach treeshaker about new cached functions and classes.

runtime/vm/precompiler.cc

 // Copyright (c) 2015, 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/precompiler.h"
 
 #include "vm/aot_optimizer.h"
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/branch_optimizer.h"
@@ skipping 464 matching lines @@
       DropFields();
       TraceTypesFromRetainedClasses();
       DropTypes();
       DropTypeArguments();
 
       // Clear these before dropping classes as they may hold onto otherwise
       // dead instances of classes we will remove or otherwise unused symbols.
       DropScriptData();
       I->object_store()->set_unique_dynamic_targets(Array::null_array());
       Class& null_class = Class::Handle(Z);
+      Function& null_function = Function::Handle(Z);
       I->object_store()->set_future_class(null_class);
       I->object_store()->set_completer_class(null_class);
       I->object_store()->set_stream_iterator_class(null_class);
       I->object_store()->set_symbol_class(null_class);
       I->object_store()->set_compiletime_error_class(null_class);
+      I->object_store()->set_simple_instance_of_function(null_function);
+      I->object_store()->set_simple_instance_of_true_function(null_function);
+      I->object_store()->set_simple_instance_of_false_function(null_function);
+      I->object_store()->set_async_set_thread_stack_trace(null_function);
+      I->object_store()->set_async_star_move_next_helper(null_function);
+      I->object_store()->set_complete_on_async_return(null_function);
+      I->object_store()->set_async_star_stream_controller(null_class);
     }
     DropClasses();
     DropLibraries();
 
     BindStaticCalls();
     SwitchICCalls();
 
     ShareMegamorphicBuckets();
     DedupStackMaps();
     DedupCodeSourceMaps();
@@ skipping 3057 matching lines @@
 
   ASSERT(FLAG_precompiled_mode);
   const bool optimized = function.IsOptimizable();  // False for natives.
   DartPrecompilationPipeline pipeline(zone, field_type_map);
   return PrecompileFunctionHelper(precompiler, &pipeline, function, optimized);
 }
 
 #endif  // DART_PRECOMPILER
 
 }  // namespace dart