Enable concurrent optimization test after migrating scopes to Thread*

runtime/vm/longjump.cc

 // Copyright (c) 2011, 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/longjump.h"
 
 #include "include/dart_api.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/os.h"
 #include "vm/simulator.h"
 
 namespace dart {
 
 jmp_buf* LongJumpScope::Set() {
   ASSERT(top_ == NULL);
   top_ = Thread::Current()->top_resource();
   return &environment_;
 }
 
 
 bool LongJumpScope::IsSafeToJump() {
   // We do not want to jump past Dart frames.  Note that this code
   // assumes the stack grows from high to low.
   Thread* thread = Thread::Current();
+  Isolate* isolate = thread->isolate();
   uword jumpbuf_addr = Isolate::GetCurrentStackPointer();
 #if defined(USING_SIMULATOR)
-  Isolate* isolate = thread->isolate();
-  ASSERT(isolate->MutatorThreadIsCurrentThread());
   uword top_exit_frame_info = isolate->simulator()->top_exit_frame_info();
 #else
   uword top_exit_frame_info = thread->top_exit_frame_info();
 #endif
+  if (!isolate->MutatorThreadIsCurrentThread()) {
+    // A helper thread does not execute Dart code, so it's safe to jump.
+    ASSERT(top_exit_frame_info == 0);
+    return true;
+  }
   return ((top_exit_frame_info == 0) || (jumpbuf_addr < top_exit_frame_info));
 }
 
 
 void LongJumpScope::Jump(int value, const Error& error) {
   // A zero is the default return value from setting up a LongJumpScope
   // using Set.
   ASSERT(value != 0);
   ASSERT(IsSafeToJump());
 
@@ skipping 10 matching lines @@
   // Remember the error in the sticky error of this isolate.
   isolate->object_store()->set_sticky_error(error);
 
   // Destruct all the active StackResource objects.
   StackResource::UnwindAbove(thread, top_);
   longjmp(environment_, value);
   UNREACHABLE();
 }
 
 }  // namespace dart