Fix windows build

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
diff --git a/runtime/vm/isolate.h b/runtime/vm/isolate.h
index 86575f01ffb0c2a0b0df8e0976ad7be890524609..5c05638d41b8d958155fd0526f203b4406ddea04 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -188,6 +188,10 @@ class Isolate : public BaseIsolate {
   ObjectStore* object_store() const { return object_store_; }
   void set_object_store(ObjectStore* value) { object_store_ = value; }
 
+  uword top_exit_frame_info() const {
+    return mutator_thread_->top_exit_frame_info();
+  }
+
   ApiState* api_state() const { return api_state_; }
   void set_api_state(ApiState* value) { api_state_ = value; }