Enable concurrent optimization test after migrating scopes to Thread*

runtime/vm/dart.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/dart.h"
 
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
@@ skipping 218 matching lines @@
                              const Dart_IsolateFlags& api_flags) {
   // Create a new isolate.
   Isolate* isolate = Isolate::Init(name_prefix, api_flags);
   ASSERT(isolate != NULL);
   return isolate;
 }
 
 
 RawError* Dart::InitializeIsolate(const uint8_t* snapshot_buffer, void* data) {
   // Initialize the new isolate.
-  Isolate* isolate = Isolate::Current();
-  TIMERSCOPE(isolate, time_isolate_initialization);
+  Thread* thread = Thread::Current();
+  Isolate* isolate = thread->isolate();
+  TIMERSCOPE(thread, time_isolate_initialization);
   TimelineDurationScope tds(isolate,
                             isolate->GetIsolateStream(),
                             "InitializeIsolate");
   tds.SetNumArguments(1);
   tds.CopyArgument(0, "isolateName", isolate->name());
 
   ASSERT(isolate != NULL);
   StackZone zone(isolate);
   HandleScope handle_scope(isolate);
   {
@@ skipping 126 matching lines @@
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 
 bool Dart::IsReadOnlyApiHandle(Dart_Handle handle) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->api_handles_.IsValidHandle(handle);
 }
 
 }  // namespace dart