Make function lookup in classes thread-safe:

runtime/vm/flow_graph_optimizer.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/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/branch_optimizer.h"
 #include "vm/cha.h"
 #include "vm/compiler.h"
@@ skipping 178 matching lines @@
       return false;
     }
     const Array& args_desc_array = Array::Handle(Z,
         ArgumentsDescriptor::New(call->ArgumentCount(),
                                  call->argument_names()));
     ArgumentsDescriptor args_desc(args_desc_array);
     const Function& function = Function::Handle(Z,
         Resolver::ResolveDynamicForReceiverClass(
             receiver_class,
             call->function_name(),
-            args_desc));
+            args_desc,
+            false /* allow add */));
     if (function.IsNull()) {
       return false;
     }
 
     // Create new ICData, do not modify the one attached to the instruction
     // since it is attached to the assembly instruction itself.
     // TODO(srdjan): Prevent modification of ICData object that is
     // referenced in assembly code.
     const ICData& ic_data = ICData::ZoneHandle(Z,
         ICData::NewFrom(*call->ic_data(), class_ids.length()));
@@ skipping 38 matching lines @@
     if (!owner_class.is_abstract() &&
         !CHA::HasSubclasses(owner_class) &&
         !CHA::IsImplemented(owner_class)) {
       const Array& args_desc_array = Array::Handle(Z,
           ArgumentsDescriptor::New(call->ArgumentCount(),
                                    call->argument_names()));
       ArgumentsDescriptor args_desc(args_desc_array);
       const Function& function = Function::Handle(Z,
           Resolver::ResolveDynamicForReceiverClass(owner_class,
                                                    call->function_name(),
-                                                   args_desc));
+                                                   args_desc,
+                                                   false /* allow_add */));
       if (!function.IsNull()) {
         const ICData& ic_data = ICData::ZoneHandle(Z,
             ICData::NewFrom(*call->ic_data(), class_ids.length()));
         ic_data.AddReceiverCheck(owner_class.id(), function);
         call->set_ic_data(&ic_data);
         return true;
       }
     }
   }
 
@@ skipping 3137 matching lines @@
 
   // Discard the environment from the original instruction because the store
   // can't deoptimize.
   instr->RemoveEnvironment();
   ReplaceCall(instr, store);
   return true;
 }
 
 
 }  // namespace dart